|Dolphins sleep with one eye open.
Bulls are color blind.
A cow's only sweat glands are in its nose.
Mosquitoes have 47 teeth.
The Poison Arrow frog has enough poison to kill 2,200 people.
Emus can't walk backwards.
A group of unicorns is called a blessing.
A group of kangaroos is called a mob.
A group of owls is called a parliament.
A group of ravens is called a murder.
A group of bears is called a sleuth.
Twelve or more cows is called a flink.
A baby oyster is called a spat.
Some fleas have split penises like a Y shape
An elephant can be pregnant for up to 2 years
Chickens can't swallow while they are upside down.
The average garden-variety caterpillar has 248 muscles in its head.
A goldfish has a memory span of 3 seconds.
A mule won't sink in quicksand but a donkey will.
More people are killed annually by donkeys than in airplane crashes.
Animal breeders in Russia once claimed to have bred sheep with blue wool.
Penguins are the only bird that can leap into the air like porpoises.
India has 50 million monkeys.
By some unknown means, an iguana can end its own life.
Americans spend around $3 billion for cat and dog food a year.
Pigs can cover a mile in 7.5 minutes when running at top speed.
The shell constitutes 12 percent of an egg's weight.
A squid has 10 tentacles.
A snail's reproductive organs are in its head.
When a horned toad is angry, it squirts blood from its eyes.
The typical hen lays 19 dozen eggs a year.
The ostrich has a 46-foot long small intestine.
A scallop has 35 blue eyes.
A swan is the only bird with a penis
The left leg of a chicken in more tender than the right one.
The only dog that doesn't have a pink tongue is the chow.
Dogs and humans are the only animals with prostates.
The giraffe has the highest blood pressure of any animal.
Zebras can't see the color orange.
There are more insects in ten square feet of a rain forest than there are people in Manhattan.
It is possible to lead a cow upstairs but not downstairs.
The smartest dogs are the Jack Russell Terrier and Scottish Border collie. Dumbest: Afgan hound.
A rat can go without water longer than a camel can.
The fat molecules in goat milk are 5 times smaller than those found in cow milk. It takes 20 minutes for the stomach to breakdown as opposed to the hour that it takes to break down cow milk.