Young male gorillas usually leave their family group when they are about 11 years old and have their own family group by the age of 15 years old. Young female gorillas join a new group at about 8 years old.

On the ground, a group of geese is a gaggle, in the sky it is a skein.

There are twice as many kangaroos in Australia as there are people. The kangaroo population is estimated at about 40 million.

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