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Vampire Bat

Vampire Bat (Desmodus rotundus)Spanish Name: Vampiro

Vampire Bat
Vampire Bat
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  • Sightings

  • La Selva Biological Station
    Children's Eternal Rain Forest
    E.A.R.T.H. University
    Corcovado National Park
    Juan Castro Blanco National Park
    Rincon de la Vieja National Park
    Santa Elena Cloud Forest Reserve
    Monteverde Cloud Forest Reserve
    Sirena Biological Station
    Tenorio & Miravalles Protected Zone
    Santa Rosa National Park

    Habitat
    They can live in a variety of cover types, from tropical evergreen forest and tropical deciduous forest to man-made clearings and pastures.

    Range
    Vampire bats live from southern Sonora and Taulipas, Mexico to northern Argentina and Uruguay, rarely above 1,200 m in elevation.

    Physical Description
    This species, the common vampire bat, is the only vampire bat that feeds on the blood of livestock; the other two species feed on blood from birds. It is capable of the rapidly coordinated movements needed to walk, run, and hop-it needs to be agile when it feeds on prey that is ten thousands times its size. It has very long "thumbs' with calluses for these movements, and has long legs with little fur, and no tail. This small to medium-sized bat is reddish brown to gray brown with pale underparts. Vampire bats have a strong sense of smell and larger eyes with better eyesight than most other bats. Their faces are distinguished by their enlarged, flattened nose pad instead of the more common nose-leaf shape.

    Biology and Natural History
    These bats are common in areas where they can find livestock. Domestic animals provide a supply of blood more consistent and abundant than the bats can find from wildlife prey, although they may also feed on white-tailed deer. Vampires avoid emerging from their roosts during periods with high moonlight. In the dark they are efficient foragers, hunting alone or in small groups. They emit low intensity echolocation calls that effectively detect large objects (such as cows).

    Once a vampire targets a prey animal, it lands on the prey or on the ground next to it. On cattle, the bat usually bites the neck, and is not easily displaced even if prey reacts and tries to shake it off. Vampire incisors are razor sharp, but their feeding bite is painless. They expertly remove a tiny 3 mm piece of flesh from the prey and have an anticoagulant in their saliva that keeps the blood flowing the entire time that they feed. For half an hour, the vampire will stay attached to the prey, lapping blood from the wound with its long tongue. It has grooves on the underside of the tongue that function like a straw. A bat needs about 15 ml of blood each day; extracting this amount of blood from an animal the size of a cow could not hurt it unless many bats fed on it in the same night. The bats seem able to find their previous prey targets on subsequent nights and reopen the incision they made before. As intuition would suggest, these bats are sometimes responsible for transmitting the rabies virus among livestock.

    After feeding, the bats return to their roost. A vampire must feed every night; if one member in the roost is unable to find prey during the night, its relatives will regurgitate some of their fare and share it. During the day these bats roost communally in tree hollows, unused wells, or such places, but they prefer caves. Their colonies can have as many as 500 or even thousands of individuals, and they often share roosts with other species of bats. Their roosts are identifiable by the dark orange, viscous, gooey, defecation found on the floor. They are social and may groom each other. Females feed their single pups regurgitated blood when they are three months old, and the pups go hunting with their mothers when they are 5 to 6 months old.

    Diet
    These bats feed only on the blood of other animals, generally livestock.

    Height/Weight
    Adults have a head and body length of 7.5 to 9 cm; their weight varies widely.

    Taxonomy
    Order: Chiroptera
    Family: Desmodontinae

    Source
    Eisenberg, John. Mammals of the Neotropics, Vol. 1. The University of Chicago Press: Chicago, 1989.

    LaVal, Richard K. and Rodriguez-H., Bernal. Murcielagos de Costa Rica. Instituto Nacional de Biodiversidad, Costa Rica, 2002.

    Turner, D. C. in Janzen, Daniel H. Costa Rican Natural History. Chicago: University of Chicago Press, 1983.

    Wilson, D. E. in Janzen, Daniel H. Costa Rican Natural History. Chicago: University of Chicago Press, 1983.

    -Amy Strieter, Wildlife Writer

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