, and then he'd continue up this way. >> whitaker: nancy vandermey and eric barkalow moved here to be close to wildlife. and got their wish, in the form who seems to love their backyard so he's right out here where we are. >> vandermey: exactly where we ( laughs ) >> whitaker: he has come to visit at least ten times, triggering security cameras taking both video and still pictures. the area is called "cougar canyon"-- what else? >> eric barkalow: here, he's just literally made a loop around our house for some reason. >> whitaker: like proud parents with baby pictures, they show off their video scrapbook. >> barkalow: and let me point out how his paws are on the wood and not on the gravel, so that he can make as little noise as possible. they want to be silent at all times. >> whitaker: camera technology has revolutionized the way animals are studied. johanna turner is a sound effects editor for universal studios. on her own time, she's one of several citizen scientists, as they're called, who put remote cameras up in the wild, hoping to get that perfect shot. how do you know where to