The boxer would lose. As soon as the 'roo feels threatened it balances on it's tail and disembowels the boxer with it's hind feet. I know that would techically be a foul in boxing, but try explaining that to a kangaroo: they are not that smart. :-)
i still would love to see a heavy-weight boxer and an adult male angry kangaroo duke it out in the ring. not a joke, there is evidence how roos are nature's expert boxers. love it!
