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Advancing scientific knowledge and conservation of birds
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photo of Yellow-billed Duck male and hybrid female
Yellow-billed Duck male and hybrid female from Cape Town, South Africa. Photo by Jeffrey L. Peters.
06 September 2019

AOS

The Threat of a Green-Headed Monster

Affectionately known to some as the “green-headed monster,” the Mallard is one of the world’s most recognizable species of waterfowl.

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