A non migratory specie spend their days grooming, mating and giving birth in the very crowded Monfort Cave, roosting out in the open and even at the bottom of the cave. Ideally, they should be hanging in the walls and not at the ground level where they are prone to natural predators such as rats, monitor lizards, cats, crows, and even pythons.
Bats are the only mammals capable of true flight. Gestation period is 180 days and pups are born live weighing about 25% of mother’s weight. Their mother’s milk located in the mammary glands found under each of her wings is so rich that the pups grow fast and are ready to fly within fix to six weeks of birth reaching sexual maturity within 18-24 months. It is amazing to think that mother bats are able to find their own amongst thousands of pups by using their sense of smell and knowing the sound of their pup’s call.
The Rousettus are found in tropical areas. They prefer lower elevations near coasts. This type of bats is one of the most common bats found throughout the Philippines. However, it is very evident that cave roosts are nowadays practically empty due to human disturbance except for Monfort Bat Cave where they are teeming with thousands of bats per available wall and ground areas of the small 265 ft. limestone cave.
Geoffroy's rousettes have brown or grey-brown bodies, their heads are usually darker than their underparts. Their fur is short, with longer, sometimes yellow hairs around their neck and chin, most commonly seen in males. Males of this species are much larger than females. They vary in forearm length from 82.22 to 86.76 mm, the length of their bodies range from 78 to 87 mm. (Payne and Francis, 1985)