Many megabat species are highly gregarious or social.
Megabats will vocalize to communicate with each other, creating noises described as "trill-like bursts of sound", honking, or loud, bleat-like calls in various genera.
At least one species, the Egyptian fruit bat, is capable of a kind of vocal learning called vocal production learning, defined as "the ability to modify vocalizations in response to interactions with conspecifics".
Young Egyptian fruit bats are capable of acquiring a dialect by listening to their mothers, as well as other individuals in their colonies.
It has been postulated that these dialect differences may result in individuals of different colonies communicating at different frequencies, for instance.

Megabat social behavior includes using sexual behaviors for more than just reproduction.
Evidence suggests that female Egyptian fruit bats take food from males in exchange for sex.
Paternity tests confirmed that the males from which each female scrounged food had a greater likelihood of fathering the scrounging female's offspring.

Homosexual fellatio has been observed in at least one species, the Bonin flying fox (Pteropus pselaphon).
This same-sex fellatio is hypothesized to encourage colony formation of otherwise-antagonistic males in colder climates.

Megabats are mostly nocturnal and crepuscular, though some have been observed flying during the day.
A few island species and subspecies are diurnal, hypothesized as a response to a lack of predators.

Diurnal taxa include a subspecies of the black-eared flying fox (Pteropus melanotus natalis), the Mauritian flying fox (Pteropus niger), the Caroline flying fox (Pteropus molossinus), a subspecies of Pteropus pelagicus (P. p. insularis), and the Seychelles fruit bat (Pteropus seychellensis).
Many megabat species are highly gregarious or social. Megabats will vocalize to communicate with each other, creating noises described as "trill-like bursts of sound", honking, or loud, bleat-like calls in various genera. At least one species, the Egyptian fruit bat, is capable of a kind of vocal learning called vocal production learning, defined as "the ability to modify vocalizations in response to interactions with conspecifics". Young Egyptian fruit bats are capable of acquiring a dialect by listening to their mothers, as well as other individuals in their colonies. It has been postulated that these dialect differences may result in individuals of different colonies communicating at different frequencies, for instance.
Megabat social behavior includes using sexual behaviors for more than just reproduction. Evidence suggests that female Egyptian fruit bats take food from males in exchange for sex. Paternity tests confirmed that the males from which each female scrounged food had a greater likelihood of fathering the scrounging female's offspring.
Homosexual fellatio has been observed in at least one species, the Bonin flying fox (Pteropus pselaphon). This same-sex fellatio is hypothesized to encourage colony formation of otherwise-antagonistic males in colder climates.
Megabats are mostly nocturnal and crepuscular, though some have been observed flying during the day. A few island species and subspecies are diurnal, hypothesized as a response to a lack of predators.
Diurnal taxa include a subspecies of the black-eared flying fox (Pteropus melanotus natalis), the Mauritian flying fox (Pteropus niger), the Caroline flying fox (Pteropus molossinus), a subspecies of Pteropus pelagicus (P. p. insularis), and the Seychelles fruit bat (Pteropus seychellensis).
Megabat