Ah, know that one... As I live in a smaller land, we ask ourselves the same thing about chickens. I won't answer it yet, so as to not spoil the mystery for others... ;-)
How do you kill a blue elphant? With a blue elphant gun. How do you kill a red elephant? You tie up his trunk until he turns blue and shoot him with a blue elphant gun. How does an elephant climb a tree? Hides in a hazelnut and waits for a squirell to pick him up