Help with gulls

[sbruenjes]

I saw these birds today at Liberty State Park in Jersey City, NJ. Any help would be greatly appreciated.

 

[Jefferson Shank]

I'd say they are juvenile Herring Gulls for pics 1-3 and adult Herring Gull for the last picture. Any of you others want to confirm it or give your opinion?

[AlexHenry]

Herring Gull is correct. For the juveniles, note the solidly dark outer and the paler inner primaries in flight, and the stout, pink-based, black-tipped bill. Can't really tell what's going on in the last photo, maybe Herring as well.

[sbruenjes]

Thank you! That is very much appreciated

[Tony Leukering]

None of the first three Herring Gulls are juveniles, as they're in post-juvenile plumages, so are immatures. After October, any first-cycle Herrings in the East can be assumed to be transitioning out of juvenile plumage until proven otherwise; it's a bit different in the West. The first and third are in what is thought to be first alternate, while the second is in second basic and is a year older than the others. The fourth bird is an adult Herring Gull (note the wide and distinct tertial crescent; https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf).

https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf