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Philippine tomb bats communicate and perceive their environment via echolocation. Though they have rather large and well-developed eyes, echolocation is the primary method that these bats use to locate, identify, and track prey as well as perceiving their environment and avoiding obstacles. By sending out short bursts of sonic and ultrasonic waves from their mouths, which then bounce off objects, these bats can efficiently move through their environment, even in the dark. There is new research that indicates that these bats also use echolocation to communicate with each other, but specific mechanisms are not yet known.
Detailed information on communication in Philippine tomb bats is unavailable. However, males are known to secrete a sticky substance during mating season which sticks to their beard. This substance likely contains pheromones or hormones, and so plays a role in chemical communication.
Although details are lacking, some tactile communication is undoubtedly of importance between mothers and their offspring, as well as between mates.
Communication Channels: tactile ; acoustic ; chemical
Other Communication Modes: pheromones
Perception Channels: visual ; tactile ; acoustic ; ultrasound ; echolocation ; chemical
Philippine tomb bats are not known to be threatened or endangered. They are not listed on any government or third-party watch list.
US Federal List: no special status
CITES: no special status
There are no known adverse affects of Philippine tomb bats on humans. Like other bats, they can carry and transmit rabies.
Negative Impacts: injures humans (carries human disease); causes or carries domestic animal disease
Farmers must deal with millions of dollars worth of crop damage per year, due to destructive insect species. Bats of the family Emballonuridae consume tons of insects per year, providing a natural solution to insect pest problems.
Positive Impacts: controls pest population
Philippine tomb bats and other bats play an invaluable role in the ecosystem. Insectivorous bats consume millions of pounds of insects every year, helping to stop the spread of disease and limit crop damage.
Philippine tomb bats are insectivores, catching their prey while soaring fast and high above the canopy. Bats in the genus Taphozous forage at relatively high altitude and high speed, catching flying insects directly in their mouths, or by scooping them up with wing/tail membranes.
Philippine tomb bats cover more area while hunting, and do not concentrate on small areas like other bats. Philippine tomb bats, like other predators, follow their prey's movements to new hunting grounds. Seasonal changes in prey density also cause T. melanopogon phillipinensis to move to new hunting grounds.
Animal Foods: insects
Primary Diet: carnivore (Insectivore )
Philippine tomb bats (Taphozous melanopogon phillipinensis) are a subspecies of the widespread species, black-bearded tomb bats, found throughout much of south and southeast Asia and the Malay archipelago. Philippine tomb bats are found exclusively on the islands of the Philippines.
Biogeographic Regions: oriental (Native )
Other Geographic Terms: island endemic
Philippine tomb bats inhabit a variety of areas, from rainforests to woodlands. They are often found in hilly forest country near water but they may roost in many places including tombs, caverns, caves, rock crevices, sea cliffs, and trees. They are also becoming common in urban areas, roosting in buildings and churches. The bats are very agile while crawling, and are able to cling to sheer rock surfaces. This enables them to live places where other bats may not. Also, they often roost in well-lit areas that other bats avoid. Philippine tomb bats are gregarious and their relatively large colonies have been recorded with up to 4,000 individuals. Typically, adult males stay within their defined "territory" on the wall, and groups of females roost around them.
Range elevation: 0 to 150 m.
Habitat Regions: tropical ; terrestrial
Terrestrial Biomes: forest ; rainforest
Other Habitat Features: urban ; suburban
Lifespan in Philippine tomb bats is not known, but it is likely that they live longer than ten years under ideal conditions.
Philippine tomb bats have a head and body length between 62 and 100 mm, a tail length between 20 and 35 mm, and they weigh between 10 and 50 g. Their fur is white and tipped with pale brown to reddish-white. The fur on their underside is even lighter brown/tan to white. Their ears and membranes are thin and light colored, appearing white; the legs and feet of are covered with short fur. They have a simple muzzle, with no complex noseleaf. Their ears are short to moderate in length and have a short, rounded tragus. There is a well developed wing pouch that helps distinguish them from other Taphozous species. Juveniles are typically darker than adults. Adult males have a black "beard" of fur at the bottom of their jaw/top of their throat. This can make T. melanopogon phillipinensis easily identifiable, but the beard does not always appear. New research indicates this beard reflects seasonal changes and may have a role in mating systems.
Philippine tomb bats are unlike other Taphozous species in that they do not have the glandular sac that characterizes others in the genus. Instead, they have small pores in place of the sacs that open into the throat.
The wings are long and narrow, contributing to fast, long flights to forage. Philippine tomb bats fly high and fast, picking insects out of the air. Their wings are not adapted to agile flight or hovering and so they do not glean prey off the ground or off of plants. Instead, T. melanopogon phillipinensis catches flying insects by "netting" them with their flight membranes and eating them mid-air.
The tail of Philippine tomb bats penetrates the interfemoral membrane near the center and are exposed on the dorsal side; this gives them their nickname sac-winged bats. The dental formula is like other members of Emballonuridae: 2/3, 1/1, 2/2, 3/3. The first upper premolar is minute, and there is a large gap between the upper incisors.
Range mass: 10 to 50 g.
Range length: 82 to 135 mm.
Range wingspan: 50 to 75 mm.
Sexual Dimorphism: sexes colored or patterned differently; male more colorful; ornamentation
Other Physical Features: endothermic ; bilateral symmetry
Information on the specific predators is unavailable. Hawks and owls have been observed to prey on adult Philippine tomb bats and the vunerable young can fall victim to predatory birds, reptiles, mammals, and even large insects. Predation is reduced because they are most active at night and are able to avoid predators. Adults of Taphozous species are even harder to prey upon because they fly at such relatively high altitudes and speeds; generally only other flying animals can catch them. Philippine tomb bats are relatively light colored, but they forage around dusk when it is not yet completely dark.
Philippine tomb bats are often plagued by species-specific parasites that contribute to mortality.
Anti-predator Adaptations: cryptic
Male Philippine tomb bats are polygynous and will mate with multiple females. There is one mating season per year, from January to February. Female Philippine tomb bats mate with only one male and produce a single young during each mating season. During the mating season, it has been observed that small glands in adult males excrete a thick sticky substance that collects on their beards. Information on the exact nature and function of this excretion is not yet available. It is likely that this substance contains hormones/pheromones designed to help attract mates.
The mating system is characterized by resource defense polygyny. This mating system involves the male providing and defending resources essential to females. The primary resource male Philippine tomb bats defend are safe nesting sites. Since Philippine tomb bats often roost in large colonies of thousands of individuals, a safe nesting site is essential to the upbringing of young. The quality of the nesting site and the ability of a male bat to defend it determines his mating rank with females. Those males that are most successful at this resource defense are able to mate with the most and best females.
Mating System: polygynous
The mating season of Philippine tomb bats lasts from January to February. During this time, males mate with as many females as possible. Each female mates only until she is pregnant. The gestation period lasts 3 to 4 months, and a single young is born between April and May. This single offspring is nursed by the mother for 8 weeks. After this time, the young are able to feed for themselves and leave the mother forever. There is no paternal care provided by the males. Information on the age at which Philippine tomb bats reach sexual maturity is unavailable.
Breeding interval: Philippine tomb bats breed once yearly.
Breeding season: Breeding occurs in January and February.
Average number of offspring: 1.
Average gestation period: 4 months.
Average weaning age: 8 weeks.
Average time to independence: 8 weeks.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous
The parental investment found in Philippine tomb bats is provided exclusively by the mother. The mating system is polygynous, so a male may father multiple offspring. However, he will not provide and care for any of his young. The mother will provide nourishment/food, shelter, and protection for the young. Weaning will conclude about eight weeks after birth, and at this time the young will learn to catch insects and other prey on their own. Once the young are old enough to feed for themselves, they are on their own.
Parental Investment: no parental involvement; altricial ; female parental care ; pre-fertilization (Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Provisioning: Female, Protecting: Female)
