Science News Roundup: Mega crocs, mega fires and enamel-sporting crayfish!

Does this mean crayfish should brush?

A University of Iowa scientist has announced the discovery of the largest "true crocodile" in East Africa. At 27 feet long, Crocodylus thorbjarnarsoni probably could have swallowed the 4-foot tall humans who lived alongside (but not too close!).

Analysis of a genetic database of horses indicates that domestic horses originated in the steppes of modern-day Ukraine, southwest Russia and west Kazakhstan and expanded out from there around 160,000 years ago. The herds were repeatedly restocked with wild horses as they spread across Eurasia, possibly by taking mares from the wild.