"There is a saying among the fragments of the Greek poet Archilochus which says, "The fox knows many things, but the hedgehog knows one big thing.' Scholars have differed about the correct interpretation of these dark words, which may mean no more than that the fox, for all his cunning, is defeated by the hedgehog's one defense. But, taken figuratively, the words can be made to yield a sense in which they mark one of the deepest differences which divide writers and thinkers, and, it may be, human beings in general."—Isaiah Berlin
Kangaroo Jack stole the money. And he's not giving it back. Hence, a kangaroo is a hedgehog.