Colorado June 21, 2017 7:45 am Researchers Track Rattlers' Movements Colorado researchers are implanting rattlesnakes with tracking devices in order to better understand their habits and hopefully prevent human encounters. US & World Videos 1:36 Arizona Senate repeals 1864 abortion ban 3:37 4.1-magnitude earthquake shakes Corona 1:40 Democrats say Big Oil misled public for decades about climate change 2:56 Police putting up barricades on UCLA campus after overnight brawl 4:00 Firecrackers thrown at pro-Palestinian encampment during protester clash at UCLA