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Help with gulls

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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).


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