e.e. cummings was onto something. all cats currently walking the earth, from the lions and tigers of the savannah to the tabbies curled up on your lap to monorail cat, are built for one thing: hunting.
national geographic has a neat feature on cats that goes into detail on how "the cat is one animal that nature pretty much got right the first time around." they've roamed the plains and jungles for nearly 30 million years evolving the skill, speed and form to become the ultimate killing machines.
even our happy cats at home are hunters. they may get the best food in the world but nothing compares to the thrill of the hunt. this is why you're likely to receive little "gifts" from your oh-so-thoughtful kitty; they want to show you what good little providers they are. so next time you wake up next to a dead rodent and your cat has a big smile on its face, don't get mad. just be thankful he chose the mouse over you!