Big-eared woolly bat

Description

Big-eared woolly bats are very large predatory bats, the second largest bat species in the neotropics. Their body mass typically ranges from 75 to. The length of the forearm ranges from 79 to. There are only three New World phyllostomid bats of comparable size. The dorsal hair is about 12 mm long, which is longer than that most of phyllostomid species. They also possess two lower incisors, a trait typically shared with smaller bats.

Ecology

Habitat

Big woolly-eared bats live in warm subtropical forests, usually roosting in caves and hollow logs, where prey is returned to before consumption. Geographically, they are found in southern parts of Mexico and extend through Northeastern South America, being found as far south as northern Argentina. They are typically found in areas that also host many other species of bat.

Diet

Big-eared woolly bats have diverse feeding habits. It has been shown to feed primarily on small arthropods and small vertebrates, including beetles, moths, small mammals (including opossums and rodents), birds (including passerine birds) and even other bat species. Though primarily carnivorous or insectivorous, it has also been known to eat fruit. However, in captivity, they refused to eat fruit, indicating a preference toward meat or insects. Another unique prey item for this species are geckos. This prey item was previously thought to have been only displayed in one other species of New World bat - T. cirrhosis. They are able to take prey of up to 70 g weight, but more commonly feed on smaller vertebrates of 10 to. Prey is not consumed until the bat has returned to its roost and returned to its head-down position.

Behavior

Big-eared woolly bats fly slowly, partially because of their large size, flying 1 or 2 meters above ground and usually in dense thickets. They are typically either solitary or part of a small group. Colony sizes vary between one and seven individuals, consisting of a male-female adult pair and their pup(s).

Reproduction

Big-eared woolly bats give birth to a single young per reproduction cycle, after a gestation period of more than 100 days. This is the largest parental investment exhibited in a species belonging to the Phyllostomid family. Newborn pups are born roughly 32.5% of the size of the mother, whereas other species in the Phyllostomid family range from 18.6-29.4% of mother size.

References

• Chiroptera Specialist Group 1996. . 2008 IUCN Red List of Threatened Species. Downloaded on 26 October 2008.
• Theodore H. Flemming, 2003. A Bat Man in the Tropics: Chasing El Duende.
• Eisenberg, J.F. and Redford, K.H. 1999. "Mammals of the Neotropics, Volume 3: The Central Neotropics: Ecuador, Peru, Bolivia, Brazil". University of Chicago Press.

References

1. Barquez, R.. (2015). "''Chrotopterus auritus''".
2. Medellin, Rodrigo. (1989-10-26). "Chrotopterus auritus". Mammalian Species.
3. (2007). "Fruits as unusual food items of the carnivorous bat Chrotopterus auritus (Mammalia, Phyllostomidae) from southeastern Brazil". Revista Brasileira de Zoologia.
4. (1967-05-20). "Predation of Chrotopterus auritus on Geckos". Journal of Mammalogy.
5. (August 2006). "Reproduction of Chrotopterus auritus (Peters) in captivity (Chiroptera, Phyllostomidae)". Brazilian Journal of Biology.