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sbruenjes

Help with gulls

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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.

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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

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