Hidden cameras offer unique glimpse of animals in the wild

How does a bighorn sheep say 'cheese?'Some charismatic critters caught by motion-detecting wildlife cameras seem to know how to strike a pose. But it's not just show business. As these devices get ever smaller, cheaper and more reliable, scientists across the U.S. are using them to document elusive creatures like never before. This 2011 photo from a U.S. Fish and Wildlife Service motion-activated camera shows an elephant seal in the Channel Islands National Park off the coast of Southern C...