White-winged Vampire Bat - Diaemus youngi
This bat is Diaemus youngi (Chiroptera - Phyllostomidae), one of the three extant species of vampire bats. Like the other two species (Desmodus rotundus and Diphylla ecaudata), this one is also neotropical in distribution (ranging from Mexico to South America), and also hematophagous (blood-feeding), but in this case feed mostly on blood from various bird species, including free-ranging poultry species (chickens, Guinea fowl, and turkeys), as also does Diphylla ecaudata.
The three species of vampire bats are the only mammals that obtain all nutrition from vertebrate blood (sanguinivore or hematophagy). Because of the unique challenges of this dietary niche, vampire bats possess a suite of behavioral, physiological, and morphological specializations. Morphological specializations include a dentition characterized by small, bladelike, non-occlusive cheek teeth, large canines, and extremely large, procumbent, sickle-shaped upper central incisors. Anticoagulants in the saliva of the bats ensure that blood flows freely.
D. youngi is commonly referred to as White-winged Vampire Bat, because the edges of the wings are white, and the membrane between the second and third fingers is largely white.