Indian flying fox flying foxes engage in oral sex, with males performing cunnilingus on females. The duration of oral sex is positively associated with the duration of copulation, suggesting that its purpose is to make the female more receptive to copulation and to increase the male's chances of fertilizing an ovum. Like other fruit bats, the Indian flying fox may be a natural reservoir for diseases including certain henipaviruses and flaviviruses. These can prove fatal to humans and domestic animals. Indian flying foxes in India and Bangladesh have tested positive for Nipah virus, a type of henipavirus. Due to human encroachment into their
Guam flying fox a length of about , a wingspan of about , and a body weight of . It is very similar in appearance to the Chuuk flying fox ("Pteropus insularis"). The top of the head is greyish, the back, throat and underparts brown or dark brown and the side of the neck golden-brown. Little is known of the behaviour of this flying fox but it is likely to have fed on the fruits, flowers and foliage of evergreen shrubs and trees typical of the limestone forests that occur in the northern part of Guam. Nor is much known of its reproductive