• A cat has 32 muscles in each ear.
• A cockroach can live several weeks with its head cut off.
• A hedgehog's heart beats 300 times a minute on average.
• A hippo can open its mouth wide enough to fit a 4 foot tall child inside.
• A hummingbird weighs less than a penny.
• A jellyfish is 95 percent water.

http://setiathome.berkeley.edu/forum_thread.php?id=45930