The young start to disperse at about eight months, and territorial behaviour begins at about 2.5 years (7) , although breeding does not usually begin until about 12 to 14 years in females (at a length of around 2.1 to 2.5 metres), and 16 to 17 years (at 3.1 to 3.3 metres) in males (2) (3) (7) (8) .