According to some accounts, the name bush baby comes from either the animals' cries or appearance. The South African Afrikaans name "nagapie" (little night monkey), comes from the fact that they are almost exclusively seen at night.
After a gestation period of 110-133 days, young galagos are born with half-closed eyes and are initially unable to move about independently. After a few days (6-8 days), the mother carries the infant in her mouth, and places it on branches while feeding.
Females maintain their territory but share them with their offspring. Males leave their mothers' territories after puberty but females remain, forming social groups consisting of closely related females and their young. Adult males maintain separate territories, which overlap with those of the female social groups; generally, one adult male mates with all the females in an area. Males who have not established such territories sometimes form small bachelor groups.
While their keeping as pets is not advised (like many other non-human primates, they are considered likely sources of zoonoses, diseases that can cross species barriers) it is certainly done. Equally, they're highly likely to attract attention from customs officials on importation into many countries. Reports from veterinary and zoological sources indicate captive lifetimes of 12 to 16.5 years, suggesting a natural lifetime of the order of a decade.
Galagos communicate both by calling to each other, and by marking their paths with urine. At the end of the night, group members use a special rallying call and gather to sleep in a nest made of leaves, a group of branches, or a hole in a tree.