Quirks & Quarks for Dec. 6 2014

This week, human ancestors engrave shells; mastodons are frozen out; ants clean the mean streets; elephants predict the weather; and invasive species aren't all bad.
Shell with engraving made by Homo erectus. (Photo: Wim Lustenhouwer, Vrije Universiteit)
Listen to the full episode53:38
 

Theme music bed copyright Raphaël GlucksteinCreative Commons License by-nc-nd-2.0