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  • Ultrasonic Evolution

    Ultrasonic Evolution

    Image of the Week

    The inner ear of a 13-million-year-old shark-toothed dolphin.

  • One Bone, Two Bones...

    One Bone, Two Bones...

    Image of the Week

    This short-tailed fruit bat embryo shows a pattern of bones in its limbs characteristic of all tetrapods: one bone, two bones, lots of bones, digits. 

  • Digging Your Inner Fish

    Digging Your Inner Fish

    Image of the Week

    Tiktaalik roseae, also known as the “fishapod,” is an animal that lived about 375 million years ago, with features of fish and four-legged animals.