DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Frog tadpoles. Macrophotograph of a view from above of two tadpoles of the European common frog (Rana temporaria). Frogs are air-breathing amphibians. Their larval stage (tadpoles) are wholly aquatic, and develop from fertilised eggs. The upper tadpole has reached the stage where the fore legs have formed, while the lower one still only has hind legs. In the latter, the tail is used for swimming, while in the former the tail is starting to be reabsorbed into the body. The hind legs have feet with webbed digits. The head includes eyes (beginning to bulge at top) and nostrils. In the lower tadpole, the fore legs are nearly ready to emerge.
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