While the bones of most airborne birds are hollow for lightness, penguins are endowed with solid bones for ballast when they dive, sometimes to 850 feet or more.
The two hemispheres of a dolphin's brain work independently. For 8 hours, the entire brain is awake. The left side then sleeps for 8 hours. When it wakes up, the right side sleeps for 8 hours. Thus, the dolphin gets 8 hours of sleep without ever having to stop physically.
The underwater mating song of the toadfish is so loud that sometimes it can be heard by humans on the shore.
Wildlife biologists estimate that as many as five out of six fawns starve to death during a hard winter in Vermont.
With few exceptions, birds do not sing while on the ground. They sing during flight or while sitting on an object off the ground.
With only a four-week gestation period, a cottontail rabbit can produce 5 to 7 litters, and as many as 35 offspring per year.
Within the hawk, or birds of prey, family, there are 208 species — eagles, hawks, kites, and Old World vultures, which are found nearly worldwide.
Wolf packs could be found in all the forests of Europe, and in 1420 and 1438, wolves roamed the streets of Paris.
Wood frogs are freeze-tolerant and spend winters frozen on land, only to thaw in the spring and begin their breeding process in vernal ponds.
You can identify a grizzly bear's mark by the sign of five claws. A black bear will lacerate a tree trunk with four claws.
You can tell the sex of a horse by its teeth. Most males have 40, females have 36.
You could milk about six cows per hour by hand, but with modern machinery, you can milk up to 100 cows per hour.
Young birds such as ducks, geese, and shore birds are born with their eyes open.
Zebras, like other equids, have three gaits: the walk, the trot, and the gallop.
Zebus are humped cattle found in India, China, and northern Africa. Zebubs are tsetse-like flies found in Ethiopia.
A camel can lose up to 30 percent of its body weight in perspiration and continue to cross the desert. A human would die of heat shock after sweating away only 12 percent of body weight.
A camel can shut its nostrils during a desert sandstorm.
A camel with one hump is a Dromedary, while a camel with two humps is a Bactrian.
A carnivore is a meat-eating animal. A frugivore is a fruit-eating animal.
A cat has 32 muscles in each ear.
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