This looks to be a Lesser Scaup - but pictures can be deceiving. However, when it comes to Scaup weight matters. Greater Scaup are about 1/2 pound heavier than Lesser - If it's built like a tank it's a greater. This Scaup is a little bigger than the Ring-necks but not much.
The tell tail sign is the dark spot at the tip of the bill. If it's narrow then its a Lesser. I took this photo yesterday of a female Greater Scaup in Newport, Oregon. She has a very wide nail 
at the tip of her bill.
at the tip of her bill. Elizabeth Laver-Holencik
Oregon birder
Also, I'm on this website because my sister lives in Maine and she is just starting to bird. I'm trying to help her, but you all have different birds out there! Happy birding, Liz
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On Apr 11, 2021, at 5:01 AM, Cepphus <kelsey.m.sullivan@maine.gov> wrote:
Always a tough one. I was leaning more towards lesser because of head shape, bill and slight purple sheen. The flanks fit more to greater.Here is a good link that compares the two....https://www.audubon.org/news/greater-or-lesser-scaup-here-are-biggest-differences-between-two--On Saturday, April 10, 2021 at 12:16:36 PM UTC-4 jane...@gmail.com wrote:Following this, Sarah -- we have a raft of continuing Scaups in our river, and even though I came down on Greater because of head and bill shape, I'm still not sure. Happy to have any guidance.On Fri, Apr 9, 2021 at 8:29 PM Sarah Caputo <catbi...@hotmail.com> wrote:Hi,
Finally got a chance to stop and look at the little group of Ring-necked ducks in Searsmont this evening and discovered there is a single male Scaup in with them. Is there a good way to differentiate lesser from Greaters?
Pics attached, bit of a distance unfortunately. If they are still there next week will drag out the big lens.
Sarah
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