Fifty years ago author Rachel Carson documented the detrimental effects of pesticides like DDT on the environment, especially birds, in her book titled ‘Silent Spring’.  Earlier this month, a Necedah resident experienced the death of 70-some birds in his yard.  The death of the 66 juncos and 6 fox sparrows distressed Harold Carter, a retired U.S. Fish and Wildlife employee.  Carter said, “I initially thought the birds had died during the ice storm the other week.  But then officials from the Necedah National Wildlife Refuge sent six birds to the lab in Madison for testing.  It was determined the birds had died from a commercial pesticide that kills insects, cholinesterase carbonate.  The birds had just migrated from the south.”  Carter would like other area property owners who may have found dead juncos in their yards to call him.