Adult swimming at the water surface. When necessary, crocodilians can present a very reduced profile while swimming at the surface, with little more than their eyes and snout visible. When the animal submerges, a transparent nictitating membrane covers the eye, and muscles surrounding the nostils close them to prevent the influx of water. Although the mouth itself is not water-tight, an extension of the fleshy lower palate prevents water entering the oesophagus.
Photograph courtesy of Kevin Mead
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