Birth weight is approximately one fourth of the mother's weight, 20-31 grams. Babies are active on their first day of life and after 42 days they are ready to begin hunting. Behavior The tarsier has many physical characteristics that aide in hunting. Tarsiers' huge eyes help this nocturnal animal see in the dark. The sensitive ears, superficially similar to those of bats, are in constant motion.
Tarsiers use their heightened sense of hearing and smell to catch animals.
They can turn their heads in almost a 360-degree angle, enabling them to see both predators and prey. Upon locating potential prey, tarsiers adjust their position and pounce on the unsuspecting animal. Their ears are so sensitive that they can detect prey by hearing alone, and they often close their eyes before and during the catching of their prey. Once caught by the elongated hands of the tarsier, the prey is bitten several times on the head and carried to a perch where it is eaten head first. Hunting occurs at night, after the tarsier has spent the entire day sleeping in dense vegetation or in hollow trees.