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teeth

  • A skeleton of a saber-toothed tiger. (Ryan Somma, Wikimedia Commons)
    Saber-Toothed Tigers Were Really, Really Big
    Walker Rhea
    Maine Coons seem huge for domesticated cats. But Smilodon populator is the biggest species of one of the biggest cats of all time: the saber-toothed tiger.
  • A sea urchin has five teeth, each in its own jaw, arranged in a circle at the center of their bodies. (Steve Jurvetson, Wikimedia Commons)
    Sea Urchin Teeth
    Walker Rhea
    Sea urchins are small, furry, and sometimes colorful. They usually don't bite humans, but they do have really sharp teeth that researchers learned sharpen themselves.