Dayak fruit bat (Dyacopterus spadiceus)
Dayak fruit bats are the smallest of Dyacopterus species and are considered small to medium in size for a fruit bat. Fully mature Dayak fruit bats weigh 85 to 95 g. Their dorsal side has short dark fur that is brown-grey in color. Their ventral side is often lighter in color. Their wing membrane attaches to their second toe and their tail is small. They also have large eyes. Dayak fruit bats have a broad rostrum and a deep jaw. They have a dental formula of 18.104.22.168 on the dorsal side and 22.214.171.124 on the ventral jaw. Dayak fruit bats have very large cheek teeth specialized for eating fruit, although they are not as large as those of other species of Dyacopterus. The size of their teeth suggests that Dayak fruit bats eat large hard fruits. There is no sexual dimorphism in this species. Male Dayak fruit bats have enlarged mammary glands that can produce small amounts of milk.