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19 JUNE 2011 -- ST. LOUIS -- Dana Ripper, of the Missouri River Bird Observatory in Mashall, Mo., uses a guide to estimate the age of a Purple Martin hatchling based on feather growth while tagging hatchlings near the Norman K. Probstein Golf Course at Forest Park in St. Louis Sunday, June 19, 2011. John Miller, of St. Louis, is a volunteer who maintains several Purple Martin nesting areas, including those near the golf course in Forest Park. Photo copyright @ 2011 Sid Hastings.
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19 JUNE 2011 -- ST. LOUIS -- Dana Ripper, of the Missouri River Bird Observatory in Mashall, Mo., uses a guide to estimate the age of a Purple Martin hatchling based on feather growth while tagging hatchlings near the Norman K. Probstein Golf Course at Forest Park in St. Louis Sunday, June 19, 2011. John Miller, of St. Louis, is a volunteer who maintains several Purple Martin nesting areas, including those near the golf course in Forest Park. Photo copyright @ 2011 Sid Hastings.