A proposal for 198-foot wind turbine near Lake Erie is worrying birders about the effects on bald eagles and migratory birds that gather in the marshes and woods in Ottawa County twice a year.The proposal is being analyzed by wildlife officials. The director of the Black Swamp Bird Observatory in Oak Harbor says the coastal area is a "globally important" bird habitat. State officials say the 500-kilowatt turbine would reduce electricity costs and aid research.