[cobirds] Singing Cordilleran Flycatcher, Lafayette, Boulder

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 Denver. 

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 Olson

Chuck Hundertmark

Lafayette, CO