Black bears in Yosemite National Park and elsewhere are notorious for seeking out human food, even breaking into cars and cabins for it. A new study reveals just how much human food has contributed to the diets of Yosemite bears over the past century. Researchers estimated the proportion of human-derived food in bears' diets by analyzing chemical isotopes in hair and bone samples.
Fuente : http://www.eurekalert.org/pub_releases/2014-03/uoc...
Fuente : http://www.eurekalert.org/pub_releases/2014-03/uoc...