A yawning hippo is in fact opening its mouth to show off the size of its teeth, particularly the larger lower canines. This is a threat and a warning sign that ... ... <看更多>
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A yawning hippo is in fact opening its mouth to show off the size of its teeth, particularly the larger lower canines. This is a threat and a warning sign that ... ... <看更多>
Hippo Yawn by Rob Kroenert, via Flickr All Animals Pictures, Animals Images, Animals. More like this. Flickr. 135k followers ... ... <看更多>