Colugos

Colugos of the Philippines generally mate in February, although the mating behavior of colugos throughout Southeast Asia can occur from January to March. After a two month pregnancy, the female gives birth to a single offspring. (Although, on rare occasions, colugo females have twins.) Interestingly, because females cannot nurse more than one young at a time, they have the ability to give birth in rapid succession to stabilize the population. Thus, the female is able to become pregnant again before her young are weaned.

When born, the baby colugo measures about 10 in (25 cm) long and is fairly undeveloped; in fact, some authorities describe these young as "semi-fetal." After a baby's birth, the female carries it in a pouch which she creates by folding the flightskin under her tail. She holds her young tightly against her as she feeds; as she travels, the baby fastens itself to one of its mother's nipples. The female generally carries the baby around everywhere she goes, reducing the baby's vulnerability to predators. This relationship continues, until the young is too large and heavy for the mother to carry.