Herring gull or Lesser Black-backed gull (2 Viewers)

[Atomsplitter]

Not up on my gulls. There were mature version of both of these species at this location at the time of pictures. Tips on identifying immature gulls of these two species would be great. Pics taken in Indiana today. Thanks.

 

[Alexander Stöhr]

Hello Atomsplitter,

I hope its ok when I bump your interesting gulls up.
I hope as always for comments. Thanks!