É. Geoffroy, 1810
|Geoffroy's Rousette range|
The Geoffroy's Rousette occurs throughout the whole of Southeast Asia: Myanmar, Thailand, Cambodia, Laos, Vietnam, Singapore, Indonesia, the island of Borneo, East Timor, the Philippines, the Solomon Islands and Bismarck Archipelago, and Papua New Guinea.
Like other fruit bats, R. amplexicaudatus have sensitive hearing and sense of smell and good eyesight which help them to manoeuvre well during flight, specifically at night. What makes them different from other fruit bats is their echolocating ability. It can be distinguished by their grey-brown to brown upperpart which is darker on top of their head and paler underpart which is usually grey-brown. They have long pale hairs on the chin and neck despite having short and sparse fur. They sometimes have pale yellow tufts of hair on the side of the neck which occur in adult for this species, especially males. Most males are substantially larger than females. The most distinguishable figure of this bat besides producing a distinctive, audible clicking call is their wings. It is attached to the sides of the back and separated by a broad band of fur. The lower incisors are bifid, the canines have a longitudinal groove on the outer surface which is slightly medial to center and the first premolars are smaller than second premolars, especially on the upper jaw.
Biology and Ecology
Specimens in the Sabah Museum were collected from coconut plantations on Mantani Island and the highland of Crocker Range while the one from Sarawak was from Niah Cave. This medium-sized bat normally roosts in caves; feeds on fruit, nectar and pollen (Payne et al. 1985). It roosts dark caves, rock crevices and old tombs (Lekagul and McNeely 1977).
The Sabah Museum specimens had forearm length measurements between 82.22 to 86.76 mm for the females (NH3134, NH3142, NH3144) and an adult male from Sarawak (SM016/2) with FA 81.43 mm. The external measurements are within the range of 78 to 87 mm recorded by Payne et al. (1985) and 80–90 mm by Ingle and Heaney (1992).
- Payne, J. & Francis, C.M. (1985). A Field Guide to the Mammals of Borneo. Sabah Society: Malaysia. p. 171.
- Bonaccorso, F.J. (1998). Bats of Papua New Guinea. Washington, D.C.: Conservation International. pp. 151-155.
- "Escape from the Bat Cave". National Geographic.