The hydra, which is related to the jellyfish, can grow its body back in a couple of days if it is cut in half.

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.

The oldest dog died at the age of 29.

A M A Z I N G   F A C T S