Meet perhaps the tiniest hedgehog species ever: Silvacola acares. Its roughly 52-million-year-old fossil remains were recently identified by a University of Colorado Boulder-led team working in British Columbia. The hedgehogās scientific name means ātiny forest dweller,ā said CU-Boulder Associate Professor Jaelyn Eberle of the geological sciences department, lead author on the study. The creature -- a new genus and species to science -- was only about 2 inches long, roughly the length of an adult thumb.