DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Frog tadpole. Macrophotograph of a view from above of a tadpole of the European common frog (Rana temporaria). Frogs are air-breathing amphibians. Their larval stage (tadpoles) are wholly aquatic, and develop from fertilised eggs. This tadpole has reached the stage where the hind legs have formed. The tail is used for swimming. The hind legs have feet with webbed digits. The head (right) includes the eyes. In front of the eyes are the nares (nostrils, nasal pits). Lungs have developed by this stage, but the tadpole remains aquatic visiting the surface to breathe. The fore legs (bulges behind eyes) are nearly ready to emerge here.
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