The head of the New Canaan Police Department’s Animal Control section is asking residents in the area of Conrad Road to check their security cameras for a possible mountain lion sighting. It occurred at about 5:45 p.m. on Sunday, when a husband and wife “observed a mountain lion jump a four foot fence into their backyard and their mini Australian shepherd chased the cat to a back fence which it jumped over and disappeared into the wetlands behind the residence,” according to Animal Control Officer Allyson Halm. “This was the second sighting in two weeks,” she said. And at least the third this year, with an earlier sighting also coming near the Merritt Parkway corridor. Last July, a man told Halm that he’d seen a mountain lion pass in front of him while jogging on Hoyt Farms Road.