In Denmark there are twice as many pigs as people.

Measured in straight flight, the spine-tailed swift is the fastest bird. It flies 170 km/h (106 mph). Second fastest is the Frigate, which reaches 150 km/h (94 mph).

Of the 650 types of leeches, only the Hirudo medicinalis is used for medical treatments.

The coyote is a member of the dog family and its scientific name, “canis latrans” means barking dog.

The tongue of a blue whale is as long as an elephant.

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.