What is a kangaroo's social behavior?

It depends on the species of kangaroo, of which there are over 60. Many species live in large groups known as mobs or herds, with an alpha male. Young males must compete for domination, and the right to mate with any of the females in the mob. Domination disputes include aggressive behaviour involving kicking with the hind legs and boxing with the front feet. Some species, however, tend to be solitary, such as the euro, northern Nailtail wallaby and the red-necked pademelon.