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Study: Chemicals may hurt swallows in Minn., Wis.

Federal study says chemical contamination could be taking toll on Minn., Wis. tree swallows

A new federal study says contamination from certain house products could be taking a toll on tree swallows in Minnesota and Wisconsin.

Study: Chemicals may hurt swallows in Minn., Wis.

Federal study says chemical contamination could be taking toll on Minn., Wis. tree swallows

A new federal study says contamination from certain house products could be taking a toll on tree swallows in Minnesota and Wisconsin.

Study: Chemicals may hurt swallows in Minn., Wis.

Federal study says chemical contamination could be taking toll on Minn., Wis. tree swallows

A new federal study says contamination from certain house products could be taking a toll on tree swallows in Minnesota and Wisconsin.