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!

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 ...