Palm Warbler, Nov 13, 2011 Boulder City On Fri, Dec 2, 2022, 3:44 PM DAVID A LEATHERMAN <[email protected]> wrote:
> Kudos to Lori Z. in Fort Collins for finding a very late Northern > Waterthrush along the Poudre which was warbler species #19 on my draft list > for CO since November 1, 2022. Brandon and Tyler have added Cape May and > American Redstart, respectively, for a total so far of 21. People fluent > in eBird archives can probably find a palm record for CO since November 1 > and I seem to recall a bay-breasted in nw CO (or was that October?). > > Whatever the total is, it's almost as good as what we get during the > supposed "primetimes" of late May and September. And I'd love to know the > reason for the late flush of these individuals that "didn't get the memo" > about when it's best to migrate. Are they mostly first-time migrants (i.e. > young born last summer) from late-starting first or second nests? Are they > just not wired correctly? Are the late adults we see individuals that > didn't nest at all, or that had failed nests, late nests, or what? I was > sent a NYT article that makes the case for various species of forest > rodents that feed on forest tree seeds in Maine having different > personalities. Why not birds? Are some birds simply procrastinators? Are > more late migrants these days surviving than would have been the case "in > the old days" because current late autumn weather tends to be milder? Do > they pass on this timing to their offspring next summer? Is a > proliferation of urban plantings that support the kind of foods needed to > pull off a late migration part of it? Maybe it just *seems* like there > are more late migrants because more of us are looking than used to be the > case (see David Suddjian's recent graphs of increasing eBird checklists). > Lots of questions begging answers. > > Dave Leatherman > Fort Collins > > -- > -- > You received this message because you are subscribed to the Google > Groups "Colorado Birds" group. > To post to this group, send email to [email protected] > For more options, visit this group at > http://groups.google.com/group/cobirds?hl=en?hl=en > * All posts should be signed with the poster's full name and city. Include > bird species and location in the subject line when appropriate > * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ > --- > 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/cobirds/PH7PR12MB73541D62E2884320851D1341C1179%40PH7PR12MB7354.namprd12.prod.outlook.com > <https://groups.google.com/d/msgid/cobirds/PH7PR12MB73541D62E2884320851D1341C1179%40PH7PR12MB7354.namprd12.prod.outlook.com?utm_medium=email&utm_source=footer> > . > -- -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/cobirds?hl=en?hl=en * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ --- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CABv4Dr_wtiD5fouycT3nCVqjm_%2B0xmMntrafjUz13-KBTSAEtA%40mail.gmail.com.
