Mammal size maxed out after dinos' demise | Science News



Science News is a nonprofit.

Help us keep you informed.


Mammal size maxed out after dinos' demise

Opening new ecological niches led to worldwide boom in size

6:59pm, November 25, 2010

After dinosaurs went extinct 65 million years ago, land mammals tended to supersize and then hit a limit, roughly at the same time worldwide.

“Globally, there is a really clean pattern that shows up,” says paleoecologist Felisa A. Smith of the University of New Mexico in Albuquerque. In the broadest survey yet of big-mammal body size, she and colleagues found that mammal groups around the world tended to give rise to giant species at about the same time. The largest, for example, the hornless rhinoceros-like Indricotherium transouralicum, would have weighed about seventeen tons.

Such supersizing took

This article is only available to Science News subscribers. Already a subscriber? Log in now. Or subscribe today for full access.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content