Jared, Colorado's own John Vanderpoel has produced two excellent videotapes for gull study, one for large gulls, the other for small (The Small Gulls of North America). I learned a lot watching them, and you will too. They are not difficult to find on line by searching his name and that title.
Disclaimer - I have no financial interest in promoting these teaching tapes. Joe Roller, Denver On Fri, Feb 14, 2020 at 8:57 AM 'The "Nunn Guy"' via Colorado Birds < cobirds@googlegroups.com> wrote: > Hi Jared > > Could not find a "gull in flight ID guide" but found these useful PDFs > about gull ID: > > - http://assets.press.princeton.edu/chapters/i13273.pdf > - > http://www.johnmuirlaws.com/wp-content/uploads/2016/04/Laws_Gull_ID.pdf > - This book is excellent: > > https://www.amazon.com/Gulls-Simplified-Comparative-Approach-Identification/dp/0691156948 > > Thanks Gary Lefko, Nunn > http://www.friendsofthepawneegrassland.org/ > > On Thursday, February 13, 2020 at 5:48:04 PM UTC-7, Jared Del Rosso wrote: >> >> I've lived in Centennial for four winters now. This winter, like the last >> several, significant numbers of gulls move west to east around dawn and >> back again at dusk. Tonight, the movement was significant, with several >> large kettles of them forming to rise, gracefully, on thermals and even >> more just passing by. I didn't count tonight, but the movement spanned >> thirty or so minutes tonight. >> >> I rarely identify them and struggle to do so from far below. Most are, of >> course, Ring-billed. There were larger ones mixed in. >> >> I'm located near Arapahoe and University in Centennial. Most of the >> movement occurs right over a line of transmission towers near deKoevend >> Park, though of course the birds drift north and south of that. One wonders >> where they come from at night (Aurora Reservoir, which is almost due east?) >> and where they head. >> >> Are there any sources on ID'ing gulls in flight? >> >> Also tonight: a local magpie seemed to be gently, but conspicuously >> singing. It was especially endearing, given how noisy and brazen these >> birds usually are. >> >> - Jared Del Rosso >> Centennial, CO >> > -- > You received this message because you are subscribed to the Google Groups > "Colorado Birds" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to cobirds+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/cobirds/58a1cc31-c272-4bd2-bc53-d2c10fae5a28%40googlegroups.com > <https://groups.google.com/d/msgid/cobirds/58a1cc31-c272-4bd2-bc53-d2c10fae5a28%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CAJpZcUAE1kfaAXc4YNjwwnHOaX7-%2Bszpv1enYiwSQYgQrJL1Wg%40mail.gmail.com.
