Mastodon skull discovered in Chile

A perfectly preserved skull of a mastodon -- a relative of today's elephant -- was found here during excavation work at a water treatment plant, one of the scientists involved in the discovery said Tuesday.

Why you should never arm wrestle a saber-toothed tiger

Saber-toothed cats may be best known for their supersized canines, but they also had exceptionally strong forelimbs for pinning prey before delivering the fatal bite, says a new study in the journal PLoS ONE.

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