The seeing-eye dog, or any dog trained to guide the blind, cannot tell a red light from a green one. When it lead its master across the street, it watches the traffic flow to tell when it is safe to cross.
The groundhog is a member of the rodent family. The typical adult groundhog can weigh approximately 8 to 14 pounds and average about 22 inches in length. Groundhogs are also known as “woodchucks,” “whistle pigs,” and “marmots.”
The shoebill stork, native to Africa, is often compared to a statue. The bird will stand perfectly still for long periods waiting for fish to come to surface in the water.
The hare can travel up to 45 miles per hour, whereas the rabbit can achieve an average speed of just 35 miles per hour.
The hides of mature female blue sharks are more than twice as thick as those of males, probably as a protection against courtship bites.
What do bats' wings, elephants' ears, flamingos' legs, rabbits' ears, goats' horns, and human skin all have in common? They radiate heat to providing cooling for the animal.
The shrew is known to eat up to its own weight about every three hours. Deprived of nutrition for a day, it may starve to death.
The skin of baby mice is so transparent that one can actually see the milk flowing into them as they nurse.
When a desert tortoise spends the summer of the dry season in a burrow, it is "estivating." When an animal estivates, its metabolism slows and its temperature drops. Animals estivate or hibernate in response to extremes in temperature or lack of food or water.
The smallest bird in the world is the Cuban bee hummingbird. It is less than 2 inches long from tip of beak to tip of tail. It weighs 6/100ths of an ounce.
When a hippopotamus exerts itself, gets angry, or stays out of the water for too long, it exudes red, sweatlike mucus through its skin.
The smallest frog is the Gold frog (Psyllophryne Didactyla) of Brazil. It grows to only 9.8 mm (3/8 inch).
When a school of baby catfish are threatened, their father opens his huge mouth and the youngsters swim inside to hide. When danger has passed, he reopens his mouth and lets the fry out.
The smallest of American owls, the elf owl, often nests in the Gila woodpecker’s cactus hole after the woodpecker leaves. The owl measures barely 6 inches tall. It specializes in catching scorpions, seizing each by the tail and nipping off its stinger. It then swallows the scorpion’s body, pincers and all.
When a shrimp is first born, it is male, and it gradually evolves to female as it matures.
The smell of a skunk can be detected by a human a mile away.
When a snail hatches from an egg, it is a miniature adult, shell and all. The shell grows with the snail, and the snail never leaves the shell.
The snail mates only once in its entire life. When it does mate, however, it may take as long as 12 hours to consummate the act.
When baby opossum are born, they are so small that an entire litter can fit in a tablespoon. They live inside their mother's pouch for three months before climbing out and riding on her back.
The sound a camel makes is called "nuzzing".
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