X-ray of a frog
Frog. X-ray of a frog (family Ranidae). The frog's semi-circular jawbone gives it a wide gape for capturing prey with its tongue. The strong limb bones are adapted for powerful jumping and swimming. The forelimbs are attached to a fused shoulder girdle to take the impact of landing after a jump. The three pelvic bones are also fused, providing a fixed pivot from which the long hindlegs can kick. The rear toes are elongated and webbed to assist with swimming.
© D. ROBERTS/SCIENCE PHOTO LIBRARY
Axolotl (Ambystoma mexicanum), artwork. This aquatic freshwater amphibian is a neotonic (larva-like) salamander. The larval form fails to undergo metamorphosis, so the adult form has the external gills (purple) of the larva and remains underwater rather than emerging onto land. The axolotl also has a caudal fin running from its head to its tail. It is a predator, feeding on worms, insects, and small fish. Axolotls are found in and around Mexico City, Mexico. Because of their characteristics, they are used extensively in biological research.
© LIZZIE HARPER/SCIENCE PHOTO LIBRARY
Graceful Treefrog (Littoria gracilenta) Iron Range National Park
Graceful Treefrog (Littoria gracilenta)
Iron Range National Park, Cape York Peninsula, Australia
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