The head of the New Canaan Police Department’s Animal Control section is urging residents to leave the fawns they’re finding on lawns, in the woods and other areas of their properties alone for 24 hours after spotting the newborn deer. The mothers of fawns are typically “in calling distance and will return within seven to eight hours,” Officer Allyson Halm said. “Fawns are hard-wired to lay perfectly still and are odorless which protects them against predators,” she said. Animal Control has been fielding phone calls daily from residents about fawns being left alone. On Monday, as West School prepared for its Field Day activities, officials there found a fawn curled up by a backstop, Halm said.