Ostriches are often not taken seriously. They can run faster than horses, and the males can roar like lions. Seals used for their fur get extremely sick when taken aboard ships.
Sloths take two weeks to digest their food.
Guinea pigs and rabbits can't sweat. The pet food company Ralston Purina recently introduced, from its subsidiary Purina Philippines, power chicken feed designed to help roosters build muscles for cockfighting, which is popular in many areas of the world. Sharks and rays are the only animals known to man that don't get cancer. Scientists believe this has something to do with the fact that they don't have bones, but cartilage. The porpoise is second to man as the most intelligent animal on the planet.