... make a new nest in trees each evening to sleep in.
... babies are born in the nests.
.. .have an average lifespan of 45-50 years
... reproduce very slowly. Females only give birth every 6-7 years
... young stay with their mother until 6-7 years old
... communicate with "squeaks".
... adult males inflate their throat pouch to produce a deep call that can be heard up to a kilometer away.