Nile Crocodile (Crocodylus niloticus) basking in the sun with mouth agape. Crocodiles do not have sweat glands and therefore open their jaws to avoid overheating. Photograph taken in Zimanga Private Game Reserve (South Africa) and reproduced by permission of Emmanuel Do Linh San.

Source: Ethology - Category: Zoology Tags: FRONT COVER Source Type: research