The pet ferret was domesticated more than 500 years before the house cat.
Fingerprints of koalas are similar (in pattern, shape and size) to the fingerprints of humans
Earthworms have five hearts
Urban birds have developed a short, fast "rap style" of singing, different from their rural counterparts.
Camel's milk, which is widely drunk in Arab countries, has 10 times more iron than cow's milk.
The total combined weight of the worlds ant population is heavier than the weight of the human population.
Plastic lawn flamingos outnumber real flamingos in the U.S.A.
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 lifespan of a squirrel is about nine years.
Cats sleep up to eighteen hours a day, but never quite as deep as humans. Instead, they fall asleep quickly and wake up intermittently to check to see if their environment is still safe.
Giraffes can't cough.
All shrimp are born male, but slowly grow into females as they mature.
It takes seven years for a lobster to grow 1 pound.
Dogs have about 100 different facial expressions, most of them made with the ears.