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Trumpeter swans at risk in shrinking lakes

The deaths of two trumpeter swans from lead poisoning in Georgian Bay this year are raising questions about the environmental impact of decreasing water levels in the Great Lakes.

The swans, once feared extinct in Ontario, eat aquatic vegetation in the wild or are fed corn by humans. To help them digest their food, the birds swallow stones and pebbles.

But the swans may also accidentally swallow fishing weights or lead shotgun pellets. The ingested lead slowly poisons them until they die, said Sara Street, executive director of the Friends of Wye Marsh.   more...

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