Learn about some of the strange and unusual facts and terms in the animal kingdom.


A gill is a respiratory organ in most animals that breathe under water. Not all underwater animals have gills; some lower forms of underwater life, such as the amoeba, breathe through thin body walls.

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  • Prion


    A prion is a type of protein molecule that can exist in an abnormal form believed to be capable of causing disease and of being infectious. See more »

  • Rennet


    Rennet refers to the the stomach contents of an unweaned animal. It also refers to the membrane lining the stomach. See more »

  • Ruminant


    The ruminant is a grazing animal that chews a cud and has split hooves. Ruminants include domestic cattle, bison, buffaloes, camels and llamas, giraffes, deer, pronghorns, antelopes, sheep, and goats. See more »

  • Shell


    Some shells are so small they can hardly be seen without a microscope; the largest shell, that of the giant clam, may be four feet wide and weigh 500 pounds. See more »

  • Sources


    Need wild animal resources? Check out these sources for wild animal facts and information. See more »

  • Tail


    Most vertebrates (animals with backbones) have tails; many invertebrates (animals without backbones), such as spiders and certain insects, have no tails. See more »

  • Taxidermy


    Taxidermy is the art of preserving the skins of mammals, birds, reptiles, amphibians, and fish, and of making lifelike replicas of animals for study or for exhibition in museums and private collections. See more »

  • Temperate Forest

    Temperate Forest

    What is an temperate forest? Learn what constitutes an temperate forest and who lives there. See more »

  • Top 10 Animal Skills

    Top 10 Animal Skills

    Animal have some amazing skills. Read on to see which animals have the most amazing skills. See more »

  • Top 10 Animal vs. Aircraft Stories

    Top 10 Animal vs. Aircraft Stories

    Take a look at the top 10 bird strike stories throughout the history of aviation, from near misses to direct hits, and the aftermath that followed. See more »

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