Trilobites: As Winter Sets In, Tiny Shrews Shrink Their Skulls and Brains Researchers who documented a head-size reduction of as much as 20 percent say it may be a survival strategy to reduce energy use in the colder months. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:What is the Rosetta probe? Historic spacecraft set to crash-land on comet TODAYN.Y.C. Nature: Ode to Milkweed: Seemingly Everywhere, Yet OverlookedIs New York Ready for Solar Power?The Rosetta Spacecraft Ends Its MissionESA releases stunning images of Comet 67P as Rosetta space craft begins suicide missionStorytelling in the Virtual Age at FoST Fest