The Guadeloupe big brown bat (Eptesicus guadeloupensis ) is a species of vesper bat. It is found only on the island of Guadeloupe. It is one of the 11 species of bat found on Guadeloupe, and one of the 3 that are endemic.
It is the largest member of its genus that occurs in the New World.Its wing membranes are black in color.Its fur is bicolored, with individual hairs black at the base and lighter at the tip.The hairs are chocolate brown at the tip on its back, and buffy at the tip on its belly.From snout to tail, it is 129–133 mm (5.1–5.2 in) long.Its forearm is 49.6–51.5 mm (1.95–2.03 in) long.Ears are 22.5–24 mm (0.89–0.94 in) long, tail is 54–60 mm (2.1–2.4 in) long, and hind foot is 11–14 mm (0.43–0.55 in) long.
It is endemic to the Basse-Terre Island of Guadeloupe, which is in the Lesser Antilles of the Caribbean.It is encountered in tropical rainforests and gallery forests.It is most often found at low elevations, from 0–300 m (0–984 ft) above sea level.
Like all other members of its genus, it is diploid with 50 chromosomes and a fundamental number of 48.It is insectivorous.During the day, it is thought to roost in trees within gallery forests.It is infrequently encountered, therefore little is known about its reproduction.A post-lactating female and a juvenile female were once encountered in late July, suggesting that females could give birth in May or June.
It is currently listed as endangered by the IUCN.It meets the criteria for this designation because its population has likely declined by 30% from 1994 to 2015, it is known from fewer than five locations, its extent of occurrence is 2,500 km2 (970 sq mi), and its habitat is declining in extent and quality due to human activities and extreme weather.Major threats to this species include habitat loss, hurricanes, and the spread of exotic, invasive species such as rats, mice, and mongooses.It may also be threatened by competition with the native velvety free-tailed bat, which is abundant.