TONY CAMACHO / SCIENCE PHOTO LIBRARY TONY CAMACHO / SCIENCE PHOTO LIBRARY
Hippo with its mouth open. Hippopotamuses (Hippopotamus amphibious) are large water-loving herbivores which live in and around rivers throughout southern and eastern Africa. This posture is the hippo's threat display, used for intimidating rivals. Such a yawn displays the hippo's main weapons, its enormous lower canine teeth, which may reach 60 centimetres in length. If the threatened hippo does not back down, a savage fight may result. Photographed in Mana Pools, Zimbabwe.
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