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The toes tell the tale

20:00 EDT 22 Aug 2017 | AAAS

(Harvard University) Though modern horses now have a single toe, their earliest ancestors had three on their front legs, and four on the back. Harvard scientists are shedding new light on what drove those changes, and in a new study show that the dual pressures of increasing body weight and shrinking side toes prompted early horses' middle toes to become dramatically stronger and better able to resist forces.

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