Vultures: the Acid-Puking, Plague-Busting Heroes of the Ecosystem

Vultures are fairly disgusting birds, and when you see one circling in a movie, it's never a good sign. But every species has its niche in the ecosystem, and vultures fill the role of nature's cleanup crew. "It's a dirty job, but someone's gotta do it." And where vultures are endangered, we find out how valuable they really are.