Barnes, who goes by "Brolga" (an Aboriginal word meaning "Crane"), said that a well-placed kick from a red kangaroo can be lethal. But Roger is very real, and there's more to him than his strength.

A burly kangaroo whose buff physique shot him to internet fame has died at the age of 12. (Though at 6-foot-7 and 200 pounds, the 9-year-old kick-boxer is very strong indeed.) While Roger's arms look remarkably swole, it's his legs that pose a real threat to anyone dumb enough to tangle with him.