On the topic of montane species nesting in lowland areas: a pair of
Gray-headed Juncos apparently nested in the middle of Boulder this spring,
on the creek behind the Basemar shopping center (same spot where the Varied
Thrush and Black-throated Blue Warbler were hanging out last fall). I saw
an adult singing persistently there on 5/10 and 5/30, and found the adult
tending a brown streaky juvenile on 6/15.
Looks like Andy Belt reported a Gray-headed Junco at Rocky Mountain Arsenal
on 6/19, too.
On Wed, Jun 27, 2018 at 8:52 AM Charles Hundertmark <chundertmark8...>
> This morning from my bedroom window I heard a Cordilleran Flycatcher
> singing in the wooded stretch along an irrigation ditch. I first heard a
> Cordilleran singing in the neighborhood on June 11. I was out of town from
> June 12-20. Since returning, I’ve been hearing the Cordilleran calling on
> multiple days in the same vicinity.
> On June 12, Richard Pautsch reported a persistently singing Cordilleran in
> Are Cordilleran Flycatchers joining the growing list of montane species
> moving into lowland habitats? In Lynn Wickersham’s account for this species
> in *The Second Colorado Breeding Bird Atlas*, she notes that the species’
> population has been increasing and suggests that “…increasing availability
> of manmade nest substrates…” may be contributing to the increase. Are
> suburban homes providing a nest substrate the way cabins have in the
> mountains? Do riparian strips along streams and irrigation ditches provide
> corridors for movement?
> Will Cordilleran join Bushtits and Red-breasted Nuthatches in the list of
> montane species moving into lowland areas?
> "What does not change / is the will to change” The Kingfishers, Charles
> Chuck Hundertmark
> Lafayette, CO
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