The female knot-tying weaverbird will refuse to mate with a male who has built a shoddy nest. If spurned, the male must take the nest apart and completely rebuild it in order to win the affections of the female.
Strange creatures, jellyfish are comprised mostly of water — more than 95 percent — and have no brain, heart, or bones, and no actual eyes.
The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function, she must be able to see another pigeon. If no other pigeon is available, her own reflection in a mirror will suffice.
Sue, the world’s largest, most complete, and best preserved Tyrannosaurus rex, made her grand debut to the public on May 17, 2000 at the Field Museum in Chicago, Illinois.
Surviving all dangers, a wild cobra may live up to 20 years.
To a human, one giant octopus looks virtually the same as any other of the same size and species. This explains why divers claim to have seen the same octopus occupy a den for ten or more years. But an octopus seldom lives longer than four years.
To prevent waste, overeating, and pollution of the water, feed the fish in an aquarium twice a day an amount that takes them five minutes to completely clean up.
The penguin is the only bird that can swim, but not fly. It is also the only bird that walks upright.
To survive, most birds must eat at least half their own weight in food each day.
The pichiciego is a little-known burrowing South American animal that is related to the armadillo, but is smaller in size. The ending of the animal’s name is derived from the Spanish ciego, meaning “blind.”
The female salamander inseminates herself. At mating time, the male deposits a conical mass of jellylike substance containing the sperm. The female draws the jelly into herself, and in so doing, fertilizes her eggs.
Toads eat only moving prey.
The pigmy shrew — a relative of the mole — is the smallest mammal in North America. It weighs 1/14 ounce — less than a dime.
The first Komodo dragons to breed in the western world are at the National Zoo at the Smithsonian Institute in Washington, D.C.
Today's oldest form of horse is the Przewalski, or Mongolian Wild Horse. Survivors of this breed were discovered in the Gobi Desert in 1881.
The poison-arrow frog has enough poison to kill about 2,200 people
The first medical use of leeches dates back to approximately 2,500 years ago. The leech's saliva contains a property that acts as an anticoagulant for human blood.
Toothed sperm whales live in extended family units that, for families, constitute life-long associations. They differ from baleen whales, which form only temporary bonds.
The process of a snake shedding its skin or a crustacean casting off its outer shell is called ecdysis.
The flamingoes of East Africa have few natural enemies. In general, the only predators an adult flamingo need fear are the fish eagle and the marabou stork.
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