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Overview

Brief Summary

Biology

The indiscriminate and somewhat ferocious feeding behaviour of crocodiles is notorious, but less known is their sociable nature, a rare feature in the world of reptiles (4). Not only do female Belize crocodiles guard their nests and protect their young, males may also assist with care of the young hatchlings (2). The female constructs a mound of vegetation, up to one metre high and three metres across, situated close to water. At the end of the dry season (2), usually between April and June (5), a clutch of 20 to 45 eggs are laid, each measuring ten centimetres across. For the next 80 days, the female remains close to the nest, finally helping her young out of the nest once the eggs hatch (2). Young Belize crocodiles initially eat small fish and hunt invertebrates, such as crickets, at the water's edge (2). As they grow, the diet also expands, to include larger fish, aquatic snails, small mammals (2), crustaceans and frogs (5). Eventually, the Belize crocodile will devour anything that comes close to the water (5). During the hottest part of the day, the Belize crocodile takes refuge in an underground burrow which it has dug. This burrow, which may be several metres long, usually has an underwater entrance and a larger chamber with an air hole (5).
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Description

Like other crocodilians, the group of reptiles that inspire both fear and intrigue in people, the Belize crocodile has an elongated snout; a streamlined body protected with tough, scaly skin; and a long, muscular tail (4). Its armoured skin is variable in colour (5), although normally it is greyish-brown with black bands and spots on the tail and sides (2) (6). Juveniles are bright yellow with black banding (6), and adult males are usually darker than females, which retain more of the yellow colour (5). The eyes are pale silvery-brown (2), and placed on its head so that only these and the tip of its snout can be seen as the crocodile sits submerged in water, waiting to ambush its prey (4). Often in the past this species was confused with the American crocodile (Crocodylus acutus) (7), but it differs by its darker colouration and shorter and broader head (5) (6). The genus name of this species, Crocodylus, appropriately means 'pebble worm' in Greek (6).
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Distribution

Morelet's crocodiles are found on the eastern coastal plain of Mexico, across most of the Yucatan peninsula, and throughout Belize and northern Guatemala. Their range also overlaps that of the American crocodile, but the relationships between the two are unknown. Some Morelet's crocodiles have escaped from captive breeding areas in Mexico outside their normal range.

Biogeographic Regions: nearctic (Native ); neotropical (Native )

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Continent: Middle-America
Distribution: Belize, Guatamala, Mexico (Chiapas)  
Type locality: "Lac Flores (Yucatan)," Guatemala; restricted by Smith and Taylor (1950: 211), and Smith and Taylor (1950: 318) to "Guatemala, El Peten, Laguna de Peten".
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Range

The Belize crocodile occurs on the Atlantic coast of Central America (7), from the state of Tamaulipas, Mexico, southwards to Belize and northern Guatemala. Its range may also extend into northern Honduras (2).
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Physical Description

Morphology

The primary distinguishing feature of Crocodylus moreletii is the snout, which is uncharacteristically blunt for a crocodile. The snout has nostrils centered at its end. The eyes are situated behind the snout and ears behind the eyes. The location of all the sensory receptors are on the same plane (the top of the head) which allows them to be completely submerged in water and still have the ability to hear, see, and smell. Their eyes, which are silvery-brown, have special eyelids with nictitating membranes covering them, allowing for vision underwater. Morelet's crocodiles generally have 66 to 68 teeth, with the distinguishing purely Crocodylus characteristic of having them in perfect alignment. Their appearance and color is similar to the American crocodile, but Morelet's crocodiles tend to be a darker grayish-brown. Adults have dark bands and spots before the tail, while juveniles are a brighter yellow with black banding. Morelet's crocodiles lack bony plates (ventral osteoderums) beneath the skin. They have powerful legs with clawed webbed feet, and large tails that allow them to swim with powerful thrusts. They are medium-sized crocodiles, averaging 3 m and attaining a maximum of 4.7 m.

Range mass: 38.5 to 58.1 kg.

Average mass: 51 kg.

Range length: 2.2 to 4.7 m.

Average length: 3.0 m.

Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry

Sexual Dimorphism: male larger

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Ecology

Habitat

Morelet's crocodiles live primarily in freshwater areas such as swamps and marshes and can also be found in forested riparian habitats. Recently, C. moreletii has even been found residing in coastal brackish water. Juveniles prefer denser cover for protection, and adults tend to aestivate in burrows during the dry season.

Habitat Regions: temperate ; tropical ; terrestrial ; freshwater

Terrestrial Biomes: forest

Aquatic Biomes: lakes and ponds; rivers and streams; coastal ; brackish water

Wetlands: marsh ; swamp

Other Habitat Features: riparian

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Habitat and Ecology

Habitat and Ecology
The species inhabits mainly freshwater areas such as marshes, swamps, ponds, rivers, lagoons and man-made waterbodies, but occasionally is found in brackish or saline habitats (Alvarez del Toro and Sigler 2001, Escobedo-Galvan et al. 2008, Platt et al. 2008). Females construct a mound nest of fresh and decomposing vegetation and soil, into which 20-50 eggs are laid at the end of the dry season (usually mid-May to late June or early July). Hatching occurs in August and September, when the wet season is at its peak, after approximately 75 to 85 days of incubation (Alvarez del Toro 1974, Perez-Higareda 1980, Platt et al. 2008).

Systems
  • Terrestrial
  • Freshwater
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An inhabitant of swampland, ponds, marshes and lagoons, the Belize crocodile prefers areas of dense vegetation (2). Although it generally occurs in freshwater (2), it may also be found in the brackish waters of coastal lagoons (5).
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Trophic Strategy

Morelet's crocodiles vary in diet according to their age and size. Juveniles eat small invertebrates and fish. Sub adults feed on aquatic snails, fish, small birds, and mammals. Adults feed on larger prey, including birds, fish, lizards, turtles, and domestic animals such as dogs. They can also become cannibalistic in times of low food, eating newborns. Crocodylus moreletii is generally shy around humans, but larger ones may attack if provoked.

Animal Foods: birds; mammals; amphibians; reptiles; fish; carrion ; insects; mollusks; aquatic crustaceans

Primary Diet: carnivore (Eats terrestrial vertebrates, Piscivore )

  • Rainwater, T., B. Adair, S. Platt, T. Anderson, G. Cobb. 2002. Mercury in Morelet's Crocodile Eggs from Northern Belize. Archives of Environmental Contamination and Toxicology, 10.1007/s00244-001-0020-7: 319-324.
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Associations

While not much information is known about the specific impact of the Morelet's crocodiles on their ecosystem, they do share many similar traits with the American crocodile, such as the role of primary carnivore in the ecosystem, thus affecting nutrient dispersal and ecosystem dynamics.

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While Morelet's crocodiles tend to be dominant predators in their communities, their eggs and young often fall prey to older juveniles, larger mammals, snakes, wading birds, and gulls. A key protection from predators is their tough hide and their loud vocal cries. Larger individuals are potentially preyed upon by humans and jaguars.

Known Predators:

  • rats (Rattus)
  • wading birds (Ardeidae)
  • large snakes (Serpentes)
  • gulls (Larus)
  • jaguars (Panthera onca)

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Life History and Behavior

Behavior

Juveniles communicate through vocalization (known as barking) when born, though not much information is known about specific social communication. They tend to follow the basic patterns of all Crocodylus, which are the most vocal of all reptiles; their calls tend to differ depending on age, sex and situation. They may share the similar habit of the American crocodile, whose young are not as vocal as other species, which may be a response to high hunting pressures, resulting in a rapid adaptation for survival.

Scales covering most of the head and parts of the body are equipped with integumentary sense organs (ISO's) that perform a number of tasks, such as detecting pressure, salinity, and vibrations.

Communication Channels: visual ; tactile ; acoustic

Perception Channels: visual ; tactile ; acoustic ; vibrations ; chemical

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Life Cycle

When born, juveniles generally weigh about 31.9 grams. Morelet's crocodiles have three main life stages, classified through their length: juveniles < 100 cm, sub adults 100-150 cm, and adults >150 cm. Not much information is known about the specific life cycle of this crocodile. As in all crocodilians, however, sex is determined by the incubation temperature of the eggs.

Development - Life Cycle: temperature sex determination

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Life Expectancy

Because they are both rare and difficult to study, not much is known about specific life cycles. Morelet's crocodiles that are bred in captivity appear to have a slightly longer lifespan (up to 80 years) than those that live in the wild (50 to 65 years). Females appear to live slightly longer than males.

Range lifespan

Status: captivity:
80 (high) years.

Typical lifespan

Status: wild:
50 to 65 years.

Average lifespan

Status: wild:
60 years.

Typical lifespan

Status: captivity:
55 to 70 years.

Average lifespan

Status: captivity:
65 years.

  • Stafford, P. J., J. R. Meyer. 2000. A Guide to the Reptiles of Belize. London: Natural History Museum of London.
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Lifespan, longevity, and ageing

Maximum longevity: 25.4 years (captivity)
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Reproduction

Not much information is known about particular mating habits between males and females, although they appear to follow some of the same mating habits (such as being polygynous) of the American crocodile (Crocodylus acutus). Probably large males dominate the other males in their area, and females prefer to mate with the dominant males.

Mating System: polygynous

Oviposition for crocodiles living on the Yucatan primarily takes place in Chiapas between April and June. Crocodylus moreletii is unique because it is the only crocodile known to be exclusively mound nesting, laying between 20 and 40 eggs in nests that are approximately 3 m wide by 1 m high. Some nests have been found containing more than one female's eggs.

At hatching time, two to three months after laying the eggs, female Morelet's crocodiles have been known to carry eggs to water areas and crack them open. Reproductive rates are generally high among C. moreletii because of the relatively early maturation of the females. Not much information is available about the specific behavior of juveniles or the fertilization process. Research is currently being conducted in these areas.

Breeding interval: Morelet's crocodiles breed once a year directly before the rainy season.

Breeding season: Oviposition takes place between April and June. The incubation period lasts 2 to 3 months.

Range number of offspring: 20 to 40.

Range age at sexual or reproductive maturity (female): 7 to 8 years.

Average age at sexual or reproductive maturity (female): 7 years.

Range age at sexual or reproductive maturity (male): 7 to 8 years.

Average age at sexual or reproductive maturity (male): 7 years.

Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; oviparous

Female Morelet's crocodiles guard their nests until the eggs are ready to hatch. Studies among captive Crocodylus moreletii show females will respond to newborn vocalizations and open the nests. Males and females will also fiercely defend hatchlings against larger juveniles or other predators. Not much information is known about further interaction between juveniles and parents.

Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Protecting: Male, Female); pre-weaning/fledging (Protecting: Male, Female); pre-independence (Protecting: Male, Female)

  • Britton, A. 2002. "Crocodilian Species-Morelet's Crocodile (Crocodylis Moreletii)" (On-line ). Crocodilian Species List. Accessed 03/18/03 at http://www.flmnh.ufl.edu/natsci/herpetology/brittoncrocs/csl.html.
  • Platt, S. G., J. B. Thorbjarnason. November 2000. Population Status and Conservation of Morelet's Crocodile. Biological Conservation, 96/1: 21-29.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Crocodylus moreletii

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.

Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.

See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

GTGAATATTAATCGTTGACTTTTTTCCACTAACCACAAAGATATCGGCACCTTGTATTTTATTTTCGGCGCCTGAGCCGGAATAGTAGGCACAGCCATAAGCCTATTAATCCGAACAGAGCTCAGCCAGCCAGGTCCCTTCATAGGAGATGACCAAATTTATAATGTTATTGTTACAGCACATGCCTTTATCATAATTTTCTTTATAGTTATACCAATTATGATCGGGGGATTTGGAAATTGACTACTCCCATTAATAATTGGGGCACCCGACATAGCATTCCCTCGCATAAACAACATAAGCTTCTGATTGCTGCCCCCATCATTTACCCTACTTCTCTTTTCCGCCTTTATTGAAACTGGGGCTGGCACCGGATGAACAGTCTACCCACCACTAGCTGGAAACCTAGCCCACGCCGGACCGTCAGTAGACCTCACTATCTTCTCCCTTCACCTTGCTGGGGTATCATCCATCCTTGGAGCAATCAACTTTATTACCACAGCTATCAACATAAAACCCCCAGCAATGTCACAACAACAAACACCCCTTTTTGTATGGTCTGTTCTAGTTACAGCTGTTCTCCTACTGCTCTCACTACCCGTCCTAGCTGCAGGAATTACCATATTACTTACTGACCGAAACTTGAACACCACTTTCTTTGACCCGGCAGGAGGAGGAGACCCAATCCTATACCAACACCTTTTCTGATTTTTCGGCCACCCAGAAGTATACATCCTCATCCTCCCAGGGTTTGGAATAATCTCCCACGTAATTACCTTCTACTCAAGCAAAAAAGAACCATTTGGTTATATAGGAATARTCTGGGCCATAATGTCAATCGGCTTCCTTGGCTTCATTGTCTGAGCCCACCATATGTTTACAGTAGGAATAGATGTTGATACTCGAGCATATTTCACATCCGCCACAATAATTATCGCCATCCCCACTGGTGTAAAAGTATTCAGCTGATTAGCCACTATTTACGGGGGAGTAGTAAAATGACAAGCCCCCATGCTCTGAGCACTCGGCTTCATTTTCTTATTCACAGTTGGAGGACTAACAGGAATTGTACTAGCTAACTCGTCACTAGACATTATTCTCCACGATACCTACTATGTAGTAGCCCACTTCCACTATGTATTATCTATAGGAGCAGTGTTCGCCATCATAAGCGGGTTCACCCACTGATTCCCATTATTTACAGGATTCACCCTACACAGCACATGAACAAAAATTCAATTCATAATCATATTTACAGGTGTAAACCTAACCTTCTTCCCACAGCACTTCCTAGGCCTATCAGGAATGCCACGACGATATTCAGACTACCCAGATGCATATGCCTKCTGAAATATAATTTCCYCAATTGGGTCATTAAYCTCCATAGTATCAGTTATCCTACTCACATTTATTGTATGAGAAGCATTTTCATCAAAACGAAAAGTTCAAGTACCTRAAATGGCAAGCACAAATGTAGAATGACTAAACAATTGTCCACCATCATACCACACCTACGAAGAACCAGTCTTTGTTCAAGTACAACCAAAACTAAAGTAA
-- end --

Download FASTA File

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Statistics of barcoding coverage: Crocodylus moreletii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

Due to their valuable hide, Morelet's crocodiles were hunted almost to extinction through the years 1940 to 1950. Under the Mexican Wildlife Protection Act, hunting them became illegal and their numbers have steadily risen, although illegal poaching and habitat loss continue to threaten the animal. To counteract this, Mexico has begun breeding Morelet's crocodiles in captivity. However, some individuals have escaped to form feral populations outside of their regular breeding zones, creating a problem for the populations of American crocodile, which must compete with this newly-invasive species.

Now primary focus remains in the development of sustainable use programs, such as commercial farming. More general knowledge about the species is required first, however. Status in the south of Belize is unknown; reports suggest the species is widely distributed in the Mexican states of Tabasco, Chiapas, Yucatan and Quintana Roo, and their situation in the interior of Guatemala is unknown. There remains little information on both specific numbers and general behavior patterns needed to judge their actual status throughout most of its range.

Morelet's crocodiles are listed as Endangered under the U.S. Endangered Species Act, and are included in Appendix I of the CITES Treaty. The IUCN rates the species as "Lower Risk", but this rating would revert to Threatened or Endangered if ongoing conservation efforts were ended.

US Federal List: threatened

CITES: appendix i

IUCN Red List of Threatened Species: lower risk - conservation dependent

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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
Cedeño-Vázquez, J.R., Platt, S.G. & Thorbjarnarson, J. (IUCN Crocodile Specialist Group)

Reviewer/s
Bohm, M., Collen, B., Ram, M., Ross, J.P., Dacey, T. & Webb, G.J.W.

Contributor/s
De Silva, R., Milligan, HT, Wearn, O.R., Wren, S., Zamin, T., Sears, J., Wilson, P., Lewis, S., Lintott, P. & Powney, G.

Justification
Although Crocodylus moreletii was heavily exploited during the early and mid 20th century, populations have recovered considerably, and healthy populations thrive throughout much of the species range, therefore this species has been assessed as Least Concern. Monitoring of this species should be carried out to ensure that any future population declines are noted.

History
  • 1996
    Data Deficient
  • 1990
    Endangered
    (IUCN 1990)
  • 1988
    Endangered
    (IUCN Conservation Monitoring Centre 1988)
  • 1986
    Endangered
    (IUCN Conservation Monitoring Centre 1986)
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Current Listing Status Summary

Status: Delisted due to Recovery
Date Listed: 06/02/1970
Lead Region: Foreign (Region 10) 
Where Listed:


For most current information and documents related to the conservation status and management of Crocodylus moreletii , see its USFWS Species Profile

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Status

Classified as Lower Risk / Conservation Dependent (LR/cd) on the IUCN Red List 2007 (1) and listed on Appendix I of CITES (3).
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Population

Population
While this species has suffered population declines throughout its range, it is thought to be widely distributed in much of its original habitat (Ross 1995) and in protected areas there are healthy populations (Ross 1998). This species suffered severe population declines in the early 20th century due to exploitation (Casas-Andreu and Guzmán 1970) and was nearly extirpated in several portions of its range, however, after conservation action and legislative protection, many subpopulations are recovering (Platt and Thorbjarnarson 2000, Dominguez-Laso 2006). According to recent survey data, Domínguez-Laso (2006) estimated the population size to be between 79,000 and 100,000 individuals in Mexico. Available survey data for the three range states: Guatemala (Castañeda 2000), Mexico (CONABIO 2006) and Belize (Meerman pers. comm. in CONABIO 2006), suggest the relative abundance of C. moreletii is similar to other crocodilians that are not endangered. Morelet's Crocodile populations in Belize recovered rapidly following cessation of skin hunting, and the species is now regarded as common, even occurring within urban areas such as Belize City (Platt et al. 2008).

Population Trend
Stable
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Threats

Major Threats
Populations of Morelet's Crocodile were greatly reduced in many areas due to unregulated skin hunting, which occurred principally in the 1940s and 1950s (Alvarez del Toro 1974, Platt and Thorbjarnarson 2000). A prohibition was decreed for the region in the 1970s, but illegal hunting persisted into the 1980s and 1990s. Due to severe sanctions, illegal hunting is now thought to be minimal, but still considered to be the principal threat to population recovery in some areas. Traditional use of the species persists, especially in rural communities (Merediz-Alonso 1999, Zamudio-Acedo 2002).

Tests on wild eggs of this species show that exposure to chemical pollutants including pesticides may be a significant threat to the long-term survival of some populations (Wu et al. 2000).
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Numbers of the Belize crocodile have declined dramatically throughout its range, primarily as a result of hunting for its beautiful skin. The scale of hunting was once so massive that in the mid 1950s up to 1,000 skins could be sold in a day in a single market in Mexico. As a result, the Belize crocodile is now extinct in some parts of Mexico (2). While legal protection for the Belize crocodile now exists, enforcement is difficult and illegal hunting remains a major threat to the continued survival of this species (2). In some ways, the situation has actually worsened, with increasing development opening up some previously remote areas, allowing hunters to penetrate further into this crocodile's range (2). In addition, while in the past hunters were said to have left some of the older crocodiles so that they would continue to breed, hunters today are believed to decimate whole populations without any thought for their future (2). Furthermore, crocodiles are perceived as a threat to both humans and livestock, resulting in the occasional killing of a crocodile near human settlements, and a number of Belize crocodiles also drown in fishing and turtle nets each year (8). In Mexico, habitat destruction is believed to be causing a steady decline in numbers of the crocodile (6). Finally, the Belize crocodile may be threatened by long-term exposure to environmental contaminants, such as pesticides. While the effects of exposure are not yet fully known, the decline of American alligators (Alligator mississippiensis) in Florida following exposure to similar chemical contaminants, gives cause for concern (8).
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Management

Conservation Actions

Conservation Actions
There are diverse, ongoing conservation measures in place for this species, including captive breeding programmes, protected areas and national and international legislative protection. Monitoring of this species should be carried out.
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Conservation

Wild populations of Belize crocodiles are protected in Mexico, Belize and Guatemala (7). While enforcement of these laws is difficult (2), they have still been incredibly beneficial to this species, with population recoveries in Belize being largely attributed to a ban on crocodile skin exports. This has removed the incentive for people to hunt crocodiles and has allowed numbers to recover from previous over-harvesting (8). The Belize crocodile also occurs in a number of protected areas throughout its range (7) (8), such as the Centla Biosphere Reserve and the Sian Kaán Biosphere Preserve in Mexico, where healthy populations exist (7). Efforts to develop programmes for the sustainable use of this species are also underway, and a number of commercial farming operations have started in Mexico (7), which will lessen hunting pressure on wild populations. In addition, in Tuxtla Guiterrez Zoo, Mexico, Belize crocodiles were bred and hatchlings reared for a year before being released into areas where the species has been previously wiped out (2).
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Relevance to Humans and Ecosystems

Benefits

Although generally shy, as with any crocodile, C. moreletii has been known to bite humans if provoked.

Negative Impacts: injures humans (bites or stings)

  • Matthews, D. 1995. "Four Faces of Mexico; in the Yucatan, a wild and seldom visited wetland". Washtington Post, 01908286: E01.
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Unlike most other species of crocodilian, Morelet's crocodiles have no bony plates (called osteoderms) in their skin. This makes the skin more valuable as leather, and has motivated over-hunting.

Also, studies of the levels of mercury within the eggs of Morelet's crocodiles in Belize has also led to clues about biological contamination there.

Positive Impacts: body parts are source of valuable material; research and education

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Wikipedia

Morelet's crocodile

Morelet's crocodile (Crocodylus moreletii), also known as the Mexican crocodile, is a modest sized crocodilian found only in fresh waters of the Atlantic regions of Mexico, Belize and Guatemala.[1][2] It usually grows to about 3 metres (9.8 ft) in length. It is a Least Concern species.

Taxonomy and etymology[edit]

Morelet's crocodile was discovered in Mexico in 1850[3] and named after the French naturalist who made the discovery, P.M.A. Morelet (1809–1892).[3] It was long confused with the American and Cuban crocodiles because of similar characteristics. It was not realized that they were a separate species until the 1920s.[4]

Characteristics[edit]

Morelet's crocodile has a very broad snout[4] with 66 to 68 teeth when they are fully mature.[3] They are dark grayish-brown in color with dark bands and spots on the body and the tail.[3] This is similar to other crocodiles, like the American crocodile, but the Morelet is somewhat darker.[3] Juvenile crocodiles are bright yellow with some dark bands.[4] The crocodile’s iris is silvery brown.[3] They have four short legs, giving them a rather sprawling gait, and a long tail, which is used for swimming. The hind feet of the crocodiles are webbed. They have very explosive capabilities because of their strong muscles and are fast runners.

Size[edit]

Morelet’s crocodile is small compared to several other crocodiles. The males can become larger than the females.[4] The adult crocodile averages 2.2–3 m (7.2–9.8 ft) in length with a maximum reported length of 4.3 m (14 ft)[5] Body mass in this species is often around 38–58 kg (84–128 lb), though is likely much more in large individuals.[6] Overall, this species is similar to the Cuban and the larger American crocodiles in appearance.

Distribution and habitat[edit]

Morelet's crocodile in the wild next to Lake Coba, Quintana Roo, Mexico.

Morelet's crocodile can be found in freshwater habitats in Central America[3] and along the Gulf of Mexico stretching through Belize, Guatemala, and to Mexico.[3][7] The Belizean pine forests are an example of the type of ecoregion in which they occur.[8] In their freshwater habitats, they prefer isolated areas that are secluded. This species of crocodile can mainly be found in freshwater swamps and marshes,[3] which are located inland, and in large rivers and lakes.[9] Both of these habitats are forested to help add cover.[3]

Belize Crocodile in Schönbrunn Zoo, Vienna

The Morelet can also be found along the coast in brackish waters[1][4] and the grassy savannas on the Yucatán Peninsula.[10] These crocodiles become much more distributed during the rainy seasons when flooding occurs and it is easier for them to move elsewhere.[10]

Juvenile crocodiles live in very dense cover to protect them from other predators that might be in the area and will remain there until they become older and able to fend for themselves.[3] Adult crocodiles are known to dig out burrows during dry seasons in their area.[3] The range of this crocodile can overlap with the American crocodile, which can sometimes lead to them being confused with one another.[4]

Recently, the Morelet's crocodile has been introduced into the Rio Grande (Rio Bravo in Mexico).[11] Several newspaper outlets on the Mexican side of the border report of reptiles inhabiting the river appearing not to be the American alligator which is native to Texas, but the Morelet's crocodile which is native to Tamaulipas from San Fernando southward. Making a new danger for people who swim or illegally cross into the United States.[12][13] Crocodiles have been seen in the cities of Matamoros,[14][15][16] Reynosa[17][18][19][20][21][22] and as far north as Nuevo Laredo.[23][24] The sightings have prompted several municipal police departments to put up signs warning people about entering the river.[25]

Biology and behavior[edit]

Morelet's crocodile waiting for an ambush.

Hunting and diet[edit]

Morelet's crocodiles prey on small mammals, birds, and other reptiles.[5] These small mammals can include domesticated animals like cats and dogs.[4] Juvenile crocodiles feed largely on fish and insects until they become bigger and more capable of bringing down larger prey.[9] Crocodiles have been known to be cannibalistic,[4] this includes eating their young.

Reproduction[edit]

6 month old, at Tiergarten Schönbrunn

Breeding usually takes place between April and June[10] and the eggs or laid before the start of the rainy season.[3] Morelet's crocodiles are unique among North American crocodiles in that they build mound nests only, and not mound and hole nests.[4] These mound nests are about 3 metres (9.8 ft) wide and 1 metre (3.3 ft) high[3] and can be found near the water or on floating vegetation.[3][4] A female crocodile can lay between 20 and 45 eggs[3] and nests have been found containing eggs from more than one female.[3] The eggs are buried and the nests are guarded by females that protect their unborn young from predators.[3] The eggs usually hatch after 80 days of incubation[10] and hatchlings are normally about 17 centimetres (6.7 in) long.[2] After the eggs have hatched the female crocodile will carry her young to the water where they are protected by both parents[3] and will later leave them to fend for themselves.

Conservation[edit]

Baby Morelet's crocodiles at the Cotswold Wildlife Park, England.

Morelet's crocodile has long been threatened by habitat destruction and illegal hunting.[26] Both of these factors have significantly lowered their populations. It was hunted for its hide during the 1940s and 1950s[26] because high quality leather can be made from their skins.[27] Crocodile leather can be used to make wallets, coats and shoes.

One of the key protectors of crocodiles today is the CSG, or Crocodile Specialist Group,[28] started in 1971.[28] This is a worldwide organization of biologist and other professions coming together to conserve the 23 species of alligators and crocodiles. The CSG monitors all trading of crocodile skins[28] and helps determine if the skins are legal or were illegally taken. When this organization started, all of the crocodilian species were either threatened or endangered.[28] Today, those numbers have greatly changed.

“By 1996 one third of the crocodilian species were abundant enough to support regulated annual harvests, another third were no longer in danger of extinction, but the final one third of the species still remain endangered.”[28]

References[edit]

  1. ^ a b c Cedeño-Vázquez, J. R., Platt, S. G. & Thorbjarnarson, J. (2012). "Crocodylus moreletii". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 14 April 2014. 
  2. ^ a b "Crocodilians species (CSG)". 
  3. ^ a b c d e f g h i j k l m n o p q r s Britton, Adam. ""Crocodylus Moreletii." Crocodilians Natural History and Conservation. 2002.". 
  4. ^ a b c d e f g h i j ""Morelet's Crocodile." Angel Fire. 15 May 2003.". 
  5. ^ a b ""Morelet's Crocodile." Belize Zoo. 2007.". 
  6. ^ [1]
  7. ^ Dever, J. A; Richard E. Strauss, Thomas R. Rainwater, Scott T. McMurry, and Llewellyn D. Densmore III. “Genetic Diversity, Population Subdivision, and Gene Flow in Morelet’s Crocodile (Crocodylus moreletii) from Belize, Central America” Copeia. 2002. 4: 1078-1091.
  8. ^ C. Michael Hogan & World Wildlife Fund. 2012. Belizean pine forests. ed. M. McGinley. Encyclopedia of Earth. Washington DC
  9. ^ a b ""Freshwater Crocodile." Australia Zoo.". 
  10. ^ a b c d Navarro, Carlos. ""The Return of the Morelet’s Crocodile." Reptilia." (pdf). 
  11. ^ https://www.youtube.com/watch?v=xDv1w_izIJA
  12. ^ htttp://www.hoytamaulipas.net/index.php?v1=notas&v2=48248
  13. ^ http://www.elnuevodiario.com.ni/internacionales/16513
  14. ^ http://www.elmanana.com/diario/noticia/matamoros/matamoros/capturan_a_cocodrilo_en_casa_de_tamaulipas/1680768
  15. ^ http://www.valleycentral.com/news/story.aspx?id=332768#.VAi-xGOXLgo
  16. ^ http://www.horacero.com.mx/noticia/index.asp?id=NHCVL17947
  17. ^ http://www.valleycentral.com/news/story.aspx?id=191897
  18. ^ http://www.hoytamaulipas.net/notas/62708/Capturan-cocodrilo-en-el-Rio-Bravo.html
  19. ^ http://www.televisaregional.com/del-golfo/noticias/182401651.html
  20. ^ http://texasuproar.blogspot.com/2008/09/side-step-reynosa-alligator-could-be.html
  21. ^ http://www.valleycentral.com/news/story.aspx?id=545212#.VAi4_2OXLgo
  22. ^ http://www.valleycentral.com/news/story.aspx?id=516817#.VAi5hmOXLgo
  23. ^ http://www.nbcnews.com/id/15194637/ns/technology_and_science-science/t/fishermen-catch-crocodile-rio-grande/
  24. ^ http://www.utsandiego.com/uniontrib/20061009/news_1n9world.html
  25. ^ http://laprensa.mx/notas.asp?id=19595
  26. ^ a b ""Crocodylus Moreletii." Florida Museum.". 
  27. ^ Platt, Steven; John Thorbjarnarson. “Population status and conservation of Morelet’s Crocodile, Crocodylus moreletii, in northern Belize” Biological Conservation. 2000. 96: 21-29.
  28. ^ a b c d e King, F. ""The Crocodile Specialist Group." Crocodile Specialist Group. 4 Mar. 2002.". 

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