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Biologists have an imperfect understanding of the reproductive biology of bats, which is primarily limited to mating systems and development of neonates. Few studies have addressed parturition in bats. Most of these are not contemporary and are based on data obtained from captive animals housed in laboratories. No studies have been conducted to assess the natural parturition process of Geoffroy’s Rousette Fruit Bat  Rousettus amplexicaudatus , a Yinpterochiropteran native to Southeast Asia and the South Pacific. This study provides the first comprehensive description of parturition in this species. It is based on the natural behaviors exhibited in a wild colony of  R. amplexicaudatus  in the southern Philippines, which were recorded using high definition video cameras. The qualitative birthing model developed in this study, based on data collected from 16 pregnant females, provides new insights into the reproductive biology of this species. Female  R. amplexicaudatus  give birth while hanging upside-down. Pups are born in the head-first presentation. Females do not immediately sever the pups’ umbilical cord after birth. Instead, the cord acts as a tether, preventing the pup from falling to its death in the event that it loses its grip on the female. This appears to be an adaptive strategy meant to help overcome some of the challenges associated with giving birth while suspended and hanging upside-down.

Parturition in Geoffroy’s Rousette Fruit Bat Rousettus amplexicaudatus Geoffroy, 1810 (Chiroptera: Pteropodidae) in the Philippines