Horse Tooth (IMAGE)

PLOS

Horse Tooth

Caption

This fossilized horse (Equus) tooth shows where a series of enamel samples have been drilled to help identify seasonal fluctuations in the animal’s diet. This horse lived ~1.9 million years ago during a glacial period in Florida. A paper by University of Florida researchers appearing in the DATE issue of the journal PLoS ONE has found that ancient mammals altered their diets in response to past global warming.

Credit

Mary Warrick, <i>PLoS ONE</i>

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