TetrapodsThe word tetrapod refers to four limbed vertebrate life forms. In this section we have images of frogs and they have two arms and two legs. Other tetrapod's include reptiles, birds, and mammals.
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Parker, S., & Dowell, P. (2000). Eyewitness books skeleton (p. 63). London: DK/Dorling Kindersley.
Notice that this frog skeleton has a backbone. This makes it a member of the vertebrate group. It also has four limbs. It has two arms and two legs. This makes it a member of the tetrapod group. Reptiles, birds, and mammals also have a backbone and four limbs and are part of the vertebrate and tetrapod groups.
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Shubin, N. (2008). Your inner fish: A journey into the 3.5-billion-year history of the human body (p. 256). New York, NY: Pantheon Books
This book is the story of paleontologist Neil Shubin's discovery of the Tiktaalik fossil in the artic circle.
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Source: Marent, Thomas, and Tom Jackson. Frog. New York, N.Y.: DK, 2008. 275. Print.
This book has a lot of photographs and information about frogs and their environments and life cycles.
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Winer, Y., & Oliver, T. (2003). Frogs sing songs. Watertown, MA: Charlesbridge.
This book has a lot of drawings and paintings of frogs in their natural environments.
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Subfolders in the tetrapod section: