This is General Poodly, one of a long line of the mutant rabbit generals. He came about as a result of a nuclear war that killed off all the humans- only the strongest rabbits survived, but somewhat modified. They became smarter and formed armies against each other. This particular general is at the head of the Diffidil army, which rewards bravery with ribbons (all the metal was melted during the nuclear blast but somehow the ribbons survived).

However, a particularly brainy rabbit with a crest of white hair has just discovered E=mc^2.