She said: "A hippo opens his mouth when afraid, to say look at my big mouth and teeth, or in play to play pushing games with other hippos, [they] also yawn like we do. To show anger if threatened ...

Do elephants and hippos get along? Watch what happens when a herd of elephants encounters a sleeping group of hippos.

A leopard-sized mammal sat atop its food chain 30 million years ago, hunting early hippos, primates and elephants ... syrtos, which boasted razor-sharp teeth and a powerful jaw, belonged to ...

This is an image of hippo teeth products for sale in an ivory shop in Sheung Wan, Hong Kong Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!