Just in case you have exotic pets, the United States Postal Service has provided tips on how to move them to a new home:
http://www.usps.com/moversnet/howtopacka2.html?rf#hippos
Or if your pet is a bit less exotic:
http://www.usps.com/moversnet/pets2.html#rocks
It just goes to show you, the US Postal Service does have a sense of humor. It's just repressed.
