Gulls, Seneca Falls NY 11/18/22

[MWM]

Thinking Great Black-backed or Herring for the juvenile, and either Lesser Black-backed or Slaty-backed for the other gull?

[AlexHenry]

Herring, Lesser Black-backed

[MWM]

Thanks for the reply, what details tell it's a Lesser Black-backed instead of Slaty-backed? Even looking at Sibley's I don't really see much difference (except for the legs, and a couple inches in size).

[AlexHenry]

Slaty-backed is much rarer. Size (relative to herring gulls) and shape look like a Lesser Black-backed.

[MWM]

Thanks, the reason I was checking is there was a Slaty-backed reported at the same location a few days ago. However  this location usually gets a couple Lesser Black-backed each winter.