Several years ago during the Barr lake birding festival in September, I saw at least 3 flocks of Cassin's moving south over Barr Lake with 10 to 20 in each group.
Ira Sanders Golden, CO On Fri, Oct 6, 2017 at 7:42 AM, Nicholas Komar <[email protected]> wrote: > I agree with Dave L. The birds that appeared this fall around Fort Collins > did so during cold fronts with waves of other birds from the north. > > Nick Komar > Fort Collins CO > > On Oct 4, 2017, at 4:10 PM, DAVID A LEATHERMAN <[email protected]> > wrote: > > David and all, > > The map in Sibley is not accurate. There are breeding populations in > eastern Montana, southwestern SD, eastern WY and western Nebraska (Wildcat > Hills, etc.). *Birds of Nebraska* by Sharpe et al list them as "fairly > common breeders in the Panhandle". *Birds of Wyoming* by Faulkner > reports a count of 31 at Pine Bluffs on 3September2000. Most of these > areas have open grown ponderosa pine which looks a lot like the eastern > Black Forest in Elbert and that is where I always figured our late > September-early October Cassin's at places like the Pawnee Grasslands and > Fort Collins come from. There is also a patch of aberrant limber pine just > south of where CO-NE-WY come together in CO that is private but may also > support a breeding population. Cassin's Kingbirds show up on the > northeastern plains and along the Front Range pretty much every year about > this time of year (later than Eastern and Westerns). There seems to be > more of them this year than most, but then, there are a lot more birders > than there used to be. I think the Cassin's Kingbirds are coming from > somewhere north of us. > > > Dave Leatherman > > Fort Collins > > > ------------------------------ > *From:* [email protected] <[email protected]> on behalf of > David Suddjian <[email protected]> > *Sent:* Wednesday, October 4, 2017 3:45 PM > *To:* Colorado Birds > *Subject:* [cobirds] Cassin's Kingbird origins > > I'll suggest an answer to my own question about where the recent * > Cassin's Kingbirds* are coming from. I suggest this is a northward > movement, similar to the "reverse" migration of Tropical Kingbirds in > California, and now one from CO. Looking at eBird patterns for Wyoming and > Nebraska to the north, and CO counties that are north of or adjacent to the > main CO breeding range of Cassin's (e.g., Jefferon, Boulder, Larimer, Weld, > Adams), there is an increased frequency of occurrence in September that is > not a continuation of a late summer presence but seems to result from > migrants moving during September (and into early October). Since there is > not really a pool of birds to the north during September or late August, it > seems to me most likely that the Cassin's we are finding over the last few > weeks have moved north in a "reverse" pattern... maybe from afar away. > > Maybe this pattern is already obvious to others or established? Thoughts? > > David Suddjian > Ken Caryl Valley > Littleton, 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 [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/cobirds/CAGj6Roodmw54-HCRxnMORb56DB0KVt-QJeZJ2%2B- > 4wQC09auWDA%40mail.gmail.com > <https://groups.google.com/d/msgid/cobirds/CAGj6Roodmw54-HCRxnMORb56DB0KVt-QJeZJ2%2B-4wQC09auWDA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > -- > 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 post to this group, send email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/cobirds/SN1PR0601MB16156464D7828D9C63C7BAE5C1730%40SN1PR0601MB1615. > namprd06.prod.outlook.com > <https://groups.google.com/d/msgid/cobirds/SN1PR0601MB16156464D7828D9C63C7BAE5C1730%40SN1PR0601MB1615.namprd06.prod.outlook.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > -- > 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 post to this group, send email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/cobirds/F627CEB2-05E2-4B72-BD06-3807763B166E%40comcast.net > <https://groups.google.com/d/msgid/cobirds/F627CEB2-05E2-4B72-BD06-3807763B166E%40comcast.net?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- Ira Sanders Golden, CO "My mind is a raging torrent flooded with rivulets of thought cascading into a waterfall of creative alternatives." -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. 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