CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Tadpole head. Profile view of the head of a common frog tadpole (Rana temporaria), showing its gills (frond-like, centre left). This is the external gill stage. The gills are feathery and present a large surface for the uptake of oxygen. The head also shows an eye pit (dark spot, upper right).
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