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

Do all creatures sleep?

Sleep might seem pretty simple, but scientists are still scratching their heads over questions surrounding the slumbering state. What does sleep mean to a whale, a brown bat, a migratory bird or even an invertebrate?

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  • Tundra


    What is tundra? Learn about the tundra and the animals that occupy this habitat. See more »

  • Ungulates


    The term "ungulates," in its most common meaning and in this article, refers to animals with hooves, coverings of horn that protect the toes. See more »

  • Wildlife


    The term wildlife refers to undomesticated animals, especially mammals, birds, and fish, that are found naturally in a given area. See more »

  • Germicide


    Germicide is the substance or agent that kills microorganisms. A disinfectant is a type of germicide that kills germs that cause disease. See more »

  • Incubation


    Incubation refers to the act of providing proper physical conditions for the development of certain living organisms. See more »

  • Metazoa


    Metazoa is a term for all animals whose bodies are composed of more than one cell. See more »

  • Thorax


    The thorax is a division of certain animal bodies. It is the middle section of the body, situated between the head or neck and the abdomen. See more »

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