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Lesser Scaup | by Sandy McRuer
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Lesser Scaup

Here's a photo of two Scaup. I've been told that Lesser Scaup have a purple iridescence in the head, and Greater Scaup a green iridescence, but that that fieldmark is unreliable. So here we have birds with green and purple iridescence, yet they apear to me to be the same structurally. Are they different species or not?

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Taken on February 17, 2018