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Posts Tagged ‘Aythya affinis’

I have been seeing increasing numbers of scaups off of Occoquan Bay National Wildlife Refuge, but they stayed in the deep water, so I never managed to get a close look at them.

I think they are Greater Scaups (Aythya marila), but there is also a chance that they are the similar-looking Lesser Scaups (Aythya affinis). The differences between the two species are subtle enough that I do not feel at all confident in distinguishing between the two. The white stripe behind the bill indicates that the one in the first image is a a female. I think the one on the left in the second photo may be an immature female and the one on the right is almost certainly a female.

Greater Scaup

Greater Scaups

© Michael Q. Powell. All rights reserved.

 

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