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Dolphins’ open-mouth behaviors during play are like smiles, a study claims. Whether smiles or not, the gestures seem to be important for how dolphins communicate ...

There is a distinctive and easily recognized open-mouth expression that is the canine equivalent of a human smile, ... All vertebrate animals, except humans, have muzzles. Lions, ...

The animals increased their open mouth display mostly after perceiving others doing the same. This rate of mimicry in dolphins has been observed in certain carnivores, such as meerkats and sun bears.

What they can eat is limited to and dependent on how big the Burmese python’s mouth opening can stretch. Researchers call this the snake’s gape. More: Python challenge: Why state recommends ...