I like segregating them into separate piles and then putting the most logical matches for predator and prey in with each other in bowls for parties.
But then I'm stuck with a bowl full of camels and horses and that just doesn't work. And they put in far too few lions. Sometimes you find Abnormal Lifeform cookies in with the rest, and those I just make up stories for.
"The one with three holes and five leg appendages is a representation of a man named Sid, who got on the wrong side of a debate with a powerful sorcerer."