[cobirds] Black phoebe pair in Larimer County

Today I had the opportunity to study a reported pair of Black Phoebe at Lions Open Space in northwest Fort Collins along the Poudre River, just south of LaPorte, Colorado. These phoebes have generated some local controversy related to genetic lineage or parentage. After studying them this afternoon I noted that both emitted call notes identified by Merlin as Black Phoebe. Both had black hoods that contrasted with paler gray back and both had slight paleness to blackish chest. This paleness suggested genetic influence from eastern phoebe, which would not be unexpected as Fort Collins is in the hybrid zone. However, perusing photos of Black Phoebe in eBird, I found that these pale features are commonplace among Black Phoebes throughout their range, including birds from west coast states not in the hybrid zone. So while I admit that these two birds are not as dark as the darkest Black Phoebes, I think they fall within the range of variation that is acceptable for the species. Perhaps this pair of phoebes will breed in the area, possibly at the Overland Trail bridge over the Poudre River. I know of one previous breeding record for Black Phoebe in Larimer County. There may be others.

Nick Komar
Fort Collins CO

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