A dog was the first in space and a sheep, a duck and a rooster the first to fly in a hot air balloon.
The scales of a crocodile are made of certain, the same substance that hooves and fingernails are made of.
Some bird species, usually flightless birds, have only a lower eyelid, whereas pigeons use upper and lower lids to blink.
75% of wild birds die before they are 6 months old.
The heaviest crustacean ever found was a lobster weighing 19 kg (42 lb), caught in 1934.