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.