Lead poisoning mutes swans' brassy notes
Two Trumpeter Swans fly near one another June 4, 2006 in Barrow, Alaska.
Justin Sullivan/Getty Images
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The Wildlife Rehabilitation Center of Minnesota receives a lot of waterfowl that have missed the migration period during the late fall months.
Phil Jenni, the center's executive director, says many trumpeter swans come in with lead poisoning from ingesting particles in the region's lakes and rivers.
Listen to the audio to hear what lead poisoning does to these swans' voices.
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