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LiveScience
LiveScience
Cameron Duke

Rhino-like 'thunder beasts' grew massive in the evolutionary blink of an eye after dinos died off

Close up showing the extinct thunder beast Megacerops coloradensis on a black background

In the aftermath of the dinosaur-killing asteroid impact, a second explosion rocked the animal kingdom. 

This time, it was the mammals that blew up. Rhino-like horse relatives that had lived in the shadow of the dinosaurs became gigantic "thunder beasts" as suddenly as an evolutionary lightning strike,  new research, published Thursday (May 11) in the journal Science, shows.

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