Houseflies don’t allow their short lifespans (14 days) to hinder their musical abilities. They always hum in the key of F.
Ostriches can run faster than horses, and the male ostriches can roar like lions.
Bats are the only mammals that can fly, but wouldn’t it be awesome if humans could fly too?
Kangaroos use their tails for balance, so if you lift a kangaroo’s tail off the ground, it can’t hop.
On
 average, there are 50,000 spiders per acre in green areas. Bet you’ll 
think twice before going outside now – unless you’re this guy.
Fleas can jump up to 200 times their height. This is equivalent to a man jumping the Empire State Building in New York.
A cat has 32 muscles in each ear. All the better for them to eavesdrop on your conversations and plot your demise.
Elephants
 can smell water up to 3 miles away. They are also one of the three 
mammals that undergo menopause – the other two being humpback whales and
 human females.
Koala bears almost exclusively eat only eucalyptus leaves and nothing else.
Because
 beavers’ teeth never stop growing, they must constantly gnaw on objects
 to keep them at a manageable length. Their teeth would eventually grow 
into their brain if they didn’t maintain them.
Beware
 an ant uprising! There are one million ants for every human in the 
world. These resilient creatures also never sleep and do not have lungs.
Oysters can change gender depending on which is best for mating. Talk about successful adaptation.
Butterflies have two compound eyes consisting of thousands of lenses, yet they can only see the colors red, green and yellow.
Tigers not only have stripes on their fur, they also have them on their skin. No two tigers ever have the same stripes.
Here’s
 a tidbit that might be useful if you plan on becoming the next Steve 
Irwin: To escape the grip of a crocodile’s jaw, push your thumb into its
 eyeball – It will let you go instantly.
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