Parrots, most famous of all talking birds, rarely acquire a vocabulary of more than twenty words, however Tymhoney Greys and African Greys have been know to carry vocabularies in excess of 100 words. Both of these are highly toxic to the parrot and can be fatal. Pigs, walruses and light-colored horses can be sunburned. Rats are omnivorous, eating nearly any type of food, including dead and dying members of their own species. Rats can't throw-up.
Sharks apparently are the only animals that never get sick.
As far as is known, they are immune to every known disease including cancer. Snails produce a colorless, sticky discharge that forms a protective carpet under them as they travel along. The discharge is so effective that they can crawl along the edge of a razor without cutting themselves. Snakes are immune to their own poison. Some baby giraffes are more than six feet tall at birth.