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active adult arrived attract martins babies banded banded martin Barn Swallows birds bluebirds breeding cavities Chimney Swifts compartments crickets Dawnsong Edinboro eggs entrance holes Erie European Starlings feeding female fledged flying gourd rack hatched hawks House Sparrows insects inside installed John Tautin Lake Lonestar look Louise Chambers Manns Harbor Martin Conservation Association martin house martin landlords martins nesting mate mealworms migration natural gourds nest checks nest material nesting pairs nestlings North owl guards pairs of martins perch plastic PMCA PMCA members PMCA's pole guard porch predator guards Presque Isle Project Martinwatch Purple Mar Purple Martin colony Purple Martin Conservation Purple Martin landlords Purple Martin roost Purple Martin Update snakes species spring SREH starlings subadult success SuperGourds Texas tins tion trap Tree Swallows Troyer watch weather week Wildlife yard young