The owl is the only bird to drop its upper eyelid to wink. All other birds raise their lower eyelids.

The fastest of all fish in the sea is the swordfish, streaming forward at speeds near 68 miles per hour.

Some species of earthworms in Australia can measure more than ten feet in length.

Thinking that its parents were a camel and a leopard, the Europeans once called the animal a "camelopard." Today, it is called the giraffe.

The owl parrot can't fly, and builds its nest under tree roots.

The favorite horses of both Alexander the Great (Bucephalos) and Julius Caesar both had atavistic mutations extra toes. Horses normally have only one toe per foot, but are descended from horses with three or four toes on each limb.

Some species of freshwater eels migrate to the Sargasso Sea in the Atlantic Ocean to mate. After laying up to 20 million eggs, the female eel dies. The baby eels hatched from the eggs then make their way back to fresh water.

Thirty thousand monkeys were used in the massive three-year effort to classify the various types of polio.

The oyster is usually ambisexual. It begins life as a male, then becomes a female, then changes back to being a male, then back to being female. It may go back and forth many times.

The female American Oyster lays an average of 500 million eggs per year. Usually only one oyster out of the bunch reaches maturity

Some species of rain forest birds migrate every summer from South America to Canada to breed.

Though human noses have an impressive 5 million olfactory cells with which to smell, sheepdogs have 220 million, enabling them to smell 44 times better than man.

The Ozark blind salamander begins life with eyes and plumelike gills. As the animal matures, its eyelids fuse together and the gills disappear.

The female condor lays a single egg once every two years

Spider silk is an extremely strong material and its on-weight basis has been proven to be stronger than steel. Experts suggest that a pencil-thick strand of silk could stop a Boeing 747 in flight.

Tiger cubs are born blind and weigh only about 2 to 3 pounds (1 kg), depending on the subspecies. They live on milk for 6 to 8 weeks before the female begins taking them to kills to feed. Tigers have fully developed canines by 16 months of age, but they do not begin making their own kills until about 18 months of age.

The part of the foot of a horse between the fetlock and the hoof is the pastern

The female king crab incubates as many as 400,000 young for 11 months in a brood pouch under her abdomen.

Squirrels can climb trees faster than they can run on the ground.

The penculine titmouse of Africa builds its home in such a sturdy manner that Masai tribesman use their nests for purses and carrying cases.

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