Short-beaked echidnas sense other echidnas predominantly through smell. Recent findings suggest feces piles act as an important intra-specific form of communication.
Communication Channels: chemical
Other Communication Modes: scent marks
Perception Channels: tactile ; chemical
As of 2008, the IUCN listed Tachyglossus aculeatus as a species of Least Concern. Short-beaked echidnas have a broad distribution, a large total population with a stable trend, and are tolerant of many habitat types. They occur in protected areas and appear to lack major threats. The IUCN did suggest monitoring the number of T. aculeatus killed on major tourist roads.
US Federal List: no special status
CITES: appendix i
IUCN Red List of Threatened Species: least concern
Because short-beaked echidnas can live in agricultural areas, they may disrupt fields and gardens while foraging.
Negative Impacts: crop pest
Short-beaked echidnas are hunted for food and for ceremonial purposes, especially in New Guinea. They maintain small-scale patchiness, which is an important ecosystem service that keeps semi-arid regions functioning properly. Their diet of ants, termites, and other invertebrates may contribute to the control of these species.
Positive Impacts: food ; body parts are source of valuable material; controls pest population
The foraging pits short-beaked echidnas create become resource traps and affect soil biogeochemistry. Tachyglossus aculeatus may be important in maintaining proper nutrient circulation through small-scale patchiness in semi-arid regions.
Ecosystem Impact: creates habitat; soil aeration
Adult short-beaked echidnas eat ants, termites, and other invertebrates. They make foraging pits by disturbing the soil when looking for food, and they prefer foraging under the canopies of large trees. Their long snouts and sticky tongues reflect their specialized diet. Short-beaked echidnas dig into ant and termite nests with their front paws and poke their long, sticky tongue into nest crevices and grinds insects with its tooth pads. Their foraging habits make separating soil from food difficult. Thus, much of their feces consists of soil.
Animal Foods: insects; terrestrial non-insect arthropods
Primary Diet: carnivore (Insectivore )
Tachyglossus aculeatus is the most widely distributed extant monotreme. Subspecies of T. aculeatus are distributed throughout southern and eastern New Guinea, mainland Australia, Kangaroo Island, and Tasmania. This range includes large portions of the three countries of Australia, Indonesia, and Papua New Guinea.
Biogeographic Regions: australian (Native )
Short-beaked echidnas thrive in a variety of habitats including open woodlands, savanna, agricultural areas, semi-arid, and arid regions. Both coastal and highland areas in New Guinea are home to Tachyglossus aculeatus, along with a range of ecosystems in Australia from mild coastal regions to above snowline. Short-beaked echidnas have a broad altitudinal range from sea level to at least 1,675 meters.
Range elevation: 0 to 1,675 m.
Habitat Regions: temperate ; tropical ; terrestrial
Terrestrial Biomes: desert or dune ; savanna or grassland ; forest ; rainforest ; scrub forest ; mountains
Other Habitat Features: agricultural
The longest recorded lifespan for Tachyglossus aculeatus is 50 years in captivity. There are anecdotal accounts of wild individuals living as long as 45 years. There is no doubt this species is particularly long-lived, especially for its size. A lifespan of 50 years is 3.7 times longer than would be expected based on echidna body size. Other long-lived mammals have been observed to have peroxidation-resistant membrane composition, which describes the ratio between polyunsaturates and monounsaturates in membrane lipids. Short-beaked echidna membranes were found to have lower polyunsaturate and higher monounsaturate levels than expected. This composition indicates peroxiclation-resistant cellular membranes in T. aculeatus. Lifespan is also associated with the production of free radicals, which is proportional to metabolic rate. Short-beaked echidnas have notably low metabolic rates, with the exception of times of arousal from torpor. During these arousal periods, metabolic rates increase by up to nine times that of basal metabolic rates and free radical production is high. Therefore, T. aculeatus is thought to have stress resistance that contributes to a long lifespan. A large and complexly-structured brain may be involved with longevity in T. aculeatus. Such brain characteristics are often correlated with life history traits like slow maturation and single births in other mammals. These traits, in turn, correlate with a long lifespan.
Range lifespan
Status: wild: 45 (high) years.
Range lifespan
Status: captivity: 50 (high) days.
Average lifespan
Status: captivity: 50.0 years.
Average lifespan
Status: captivity: 49.4 years.
Short-beaked echidnas are medium-sized mammals ranging in length from about 30 to 40 cm and in weight from about 2 to 7 kg. Depending on the subspecies and location, males or females may be larger. Short-beaked echidna spines are one of their most distinguishing characteristics. These spines cover the entire dorsal surface, including a small tail. Fur is also present and may be even longer than the spines in some subspecies. Tachyglossus aculeatus lacks external pinnae and teeth but does have hard pads in the back of the mouth. Short-beaked echidnas possess several adaptations to their foraging habits including tubular snouts, long sticky tongues, and front paws for digging. Males have non-venomous spurs on the ankles of their hind legs and females have pouches on their undersides. Both males and females have a cloaca through which feces, urine, and, in females, eggs pass. Males have penises they extend through the cloaca during mating. Short-beaked echidnas, and other monotremes, have low metabolic rates and low body temperatures, which may be related to such factors as diet and environmental variation. Short-beaked echidnas have larger brains than would be expected for their body mass. The cerebral cortex, in particular, is large and highly convoluted.
Range mass: 2 to 7 kg.
Range length: 30 to 45 cm.
Other Physical Features: endothermic ; heterothermic ; bilateral symmetry
Sexual Dimorphism: sexes alike
Average basal metabolic rate: 2.327 W.
Predation is not a major threat to short-beaked echidnas, even though feral cats, pigs, dingoes, and goannas are occasional predators. Animal predators are mostly a threat to young in burrows and to subadults. Adults escape predation by hiding beneath rocks or logs, or digging into the ground until only the spiny back is exposed. Short-beaked echidnas can also curl up to protect their undersides. Despite the minimal defense of many hibernaculum materials, predation on hibernating individuals does not seem to be a problem. After introduced predators, the biggest influence on T. aculeatus mortality is the threat of motor vehicles. Over-hunting by humans may become a problem in some areas of New Guinea.
Known Predators:
Anti-predator Adaptations: cryptic
Tachyglossus aculeatus has a courtship period between June and August that can last between a few days and several weeks depending on geographic region and subspecies. Females may be pursued by one or several males during this period. Observations of multiple males following individual females have led to the term “echidna train.” Females will mate with only one male per season.
Mating System: polygynous
Gestation in Tachyglossus aculeatus lasts about 23 days, after which the female will lay a single soft-shelled egg in her pouch for incubation. Eggs hatch 10 or 11 days later. Short-beaked echidnas exhibit a long lactation stage lasting between 150 and 200 days depending on geography and subspecies. When the young leave the pouch three months later, they are covered with spines. Maturation time is lengthy. Young reach full adult size after three to five years. Hatchlings have a mass of about 0.3 kg but will grow to weigh 0.7 to 2.1 kg by weaning. Weaning mass is 28 to 48% of adult mass.
Breeding interval: Short-beaked echidnas breed once a year.
Breeding season: Mating usually occurs June through August.
Range number of offspring: 1 to 1.
Average gestation period: 23 days.
Range weaning age: 150 to 200 days.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; oviparous
Average birth mass: 0.379 g.
Average gestation period: 22 days.
Average number of offspring: 1.
Average age at sexual or reproductive maturity (male)
Sex: male: 548 days.
Average age at sexual or reproductive maturity (female)
Sex: female: 548 days.
Subspecies vary in their strategies of caring for young. Short-beaked echidnas on Kangaroo Island forage with the young in the pouch immediately post-hatching. After 45 to 55 days, mothers will deposit their young in nursery burrows, where the young will remain until weaning. Mothers return every five to ten days to nurse the young. Short-beaked echidnas in Tasmania remain in nursery burrows with the young for 25 to 35 days post-birth. Mothers then return to the burrow every three to five days to nurse. Other subspecies exhibit variations of parental care ranging between these two extremes. Mothers do not have nipples or teats, but nurse young through pores connected to their paired mammary glands.
Parental Investment: altricial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female)
