#10 on the list are pigs. As smart as chimps and some other animals. Acutally pigs are clean animals and don't always just love the pigpen status they have...but no not have sweat glands and a roll in the mud protects their skins like hippos do. If not for bacon, maybe pigs would be enjoying pig parks, instead of dogs. ;-)

http://www.msnbc.msn.com/id/24628983...nimals_science