These two young make, eastern grey kangaroos play boxing, a ritual that develops skills that lead to an alpha male needing to defend his harem of females from rival males. No 'play' is involved at this stage, and fights can be pretty brutal.

The boxing kangaroo is a national symbol of Australia and is frequently seen in pop culture. The boxing kangaroo logo is often displayed prominently by Australian spectators at sporting events, such as cricket, tennis, basketball and football matches, and the Commonwealth and Olympic Games.