At Jasper Ridge Still and Video Cameras Spy on Wildlife at Local Biological Preserve
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Cover Story SECTION 2 Candid cameras at Jasper Ridge Still and video cameras spy on wildlife at local biological preserve Story by Dave Boyce | Photos courtesy of Jasper Ridge uman trespassers used of lions in deer carcasses and to frequent the 1,200 tracks, but their numbers Hwild acres of the private weren’t clear, Mr. Hebert says. Jasper Ridge Biological Pre- With more than 20 cameras now serve until around 2009, when providing thousands of photos a collection of heat-sensitive annually, staff can recognize automatic cameras began to individual lions and monitor go up in selected areas of the visits by at least one senior male preserve to monitor the move- and one or two females. ment of warm-blooded animals. The auto-focusing digital The cameras showed another cameras are Wi-Fi-enabled and frequent presence that not been automatically upload images seen in other camera-trap proj- to the preserve’s server and ects: mountain lions. archive, where there are now Trespassing at the preserve, hundreds of thousands of pho- located off Sand Hill Road near tos, Mr. Hebert says. Woodside, has fallen way off Among the website’s peri- now that the word is out about odically updated selection of the lions, says Trevor Hebert, an photos, plus a few videos, lions academic technology specialist are ubiquitous, particularly at at the Stanford University pre- night. One video shows a couple serve. The frequency of homo walking single file. The lion in sapiens and puma concolor front ignores the camera, but sightings was “kind of a big sur- the lion bringing up the rear prise,” Mr. Hebert says. appears to look right into it, its At tinyurl.com/JR-231, there eyes transformed by the infrared Top: The surprise to staff at are candid photos of the lions sensor into bright dots of light. and many other animals, includ- The night remains dark to the the Jasper Ridge Biological ing skunks, great horned owls, animals. The impression of light Preserve was how frequently bobcats, turkeys, possums, jack- cast in front of the camera is the mountain lions visit the rabbits, foxes, coyotes, vultures action of the infrared sensor, preserve. Above: Male black- and even an American badger. Mr. Hebert says. tailed deer contend during To advertise this online archive, The sensors do not react to the town of Woodside recently movement, but to differences in mating season at Jasper Ridge. added a link at its Open Space heat. Rattlesnakes and lizards may Right: It’s still dark as this Committee home page. pass by, but being cold-blooded bobcat has its picture taken; While there is no web-cam, creatures, the cameras won’t see infrared light is not visible to there is a 24-hour live audio them. Nor will the cameras react link next to an oak tree leaning to blowing grass or falling leaves. bobcat or human eyes. over Searsville Lake, an area It was the interest in mountain that birds appear to like, if the lions that drove the installation of ubiquity of bird song heard over cameras, Mr. Hebert said. the link is any measure. 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