[Tweeters] Gull ID help - Slaty-backed?

[michael at flycatcherfile.com]

Good afternoon,

 

After reviewing pictures I took at the Cedar River mouth today, I thought
that one bird that I somehow didn't pay attention to could possibly be the
Slaty-backed Gull. I've compared it to many of the pics posted on eBird and
think it looks pretty close. Gulls are difficult for me. Here are a couple
of pics.

 

https://flic.kr/p/2mE7P9L

https://flic.kr/p/2mE3qqy

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