Unleased, Untamed and Unexplained

S1 E1: There's chaos in the animal kingdom from coast to coast. In rural Massachusetts, a woman on a morning hike has an unnerving encounter when she is stalked by a pack of coyotes. Meanwhile, the residents of a sleepy Arkansas town wake up to a stunning sight on New Year's Day -- thousands of blackbirds have inexplicably fallen from the sky. Then, two chimpanzees terrorize a suburban neighborhood in Las Vegas, leaving a 9-1-1 caller squarely in harm's way. And finally, tragedy strikes the San Francisco Zoo at closing time on Christmas Day. A tiger escapes its enclosure and goes on the attack, leaving one man dead and two others injured.