sbruenjes Posted February 17, 2020 Share Posted February 17, 2020 I saw these birds today at Liberty State Park in Jersey City, NJ. Any help would be greatly appreciated. Link to comment Share on other sites More sharing options...
Jefferson Shank Posted February 17, 2020 Share Posted February 17, 2020 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? 1 Link to comment Share on other sites More sharing options...
AlexHenry Posted February 17, 2020 Share Posted February 17, 2020 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. 1 Link to comment Share on other sites More sharing options...
sbruenjes Posted February 18, 2020 Author Share Posted February 18, 2020 Thank you! That is very much appreciated Link to comment Share on other sites More sharing options...
Tony Leukering Posted February 18, 2020 Share Posted February 18, 2020 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 1 1 Link to comment Share on other sites More sharing options...
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