| Yucatan Yellow Bats are so similar to Black-winged Little Yellow Bats that it is almost impossible to tell them apart, but their ranges do not seem to overlap. Both are tiny; if anything, Rhogeessa aeneus is slightly smaller than R. tumida. Both eat tiny flying insects; both have short, smooth, yellowish-brown fur that is paler in color next to the body; and both have visible glands on their ears. These glands, which are on the outside of the ear, are most prominent in males during the breeding season, suggesting that they are used to scent-mark females or territory or both. Females often have twins; in Belize, they were found to reproduce once a year, early in the rainy season, when food is most plentiful.
Head and Body: 37-50 mm; Tail: 28-48 mm
Goodwin, G.G., 1958. American Museum Novitates, 1923:6.
Mammal Species of the World