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Loons abandon their eggs due to black fly outbreak in Northern Wisconsin

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Glen Moberg, Wisconsin Public Radio

An outbreak of black flies in northern Wisconsin is causing nesting loons to abandon their eggs in record numbers.


The loons are being affected by a larger-than-normal swarm of one specific species of black fly, according to Chapman University researcher Walter Piper.

“2014 has been a devastating year for black flies,” said Piper. “There is a species, simulium annulus, that is a specialist on attacking and taking blood from loons.“

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