A male gorilla is typically much larger than a male kangaroo. While a kangaroo's kick can disembowel, a gorilla's heavier frame and ability to grapple an opponent would likely carry the day for it.
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The medium ox would win because it would knock the gorilla out with its hooves.
John cena would win in a fist fight an 50 cent would win in a in a gun fight
The Gorilla. More aggressive,better armed,and has the ability to stand on 2 legs and punch.
raiden would win
A lion would win because it can even kill a wolf.