Date: 4/15/17 8:32 pm From: Peter Burke <peterburke...> Subject: [cobirds] Re: Phoebes near Hygiene, Boulder Co
Cobirders, As Peter Gent described, we had quite the phoebe show up in NE Boulder County, with Say's, Eastern and a third individual. I've posted photos of the two Eastern Phoebes and several shots of the other guy <https://www.flickr.com/photos/pgburke/>, which may be a light male Black Phoebe, or potentially a hybrid Black X Eastern Phoebe. Things that made us consider a hybrid include the light color of bird's head -- not the jet black of a typical male Black Phoebe. There was also a faint suggestion of some white or at least light coloring near the throat. And most interestingly, the bird was initially singing the one-note song of a Black Phoebe, but later was observed attempting the two-note Eastern Phoebe song.
I'd be very interested to learn what others make of this bird.
On Sat, Apr 15, 2017 at 1:15 PM, Peter Gent <gent...> wrote:
> All, > > We spent over an hour this morning at the bridge over St. Vrain Creek on > Crane Hollow Road, which is about 1/2 mile west of Hygiene in north Boulder > County. When we arrived, 2 Phoebes were there. There was an Eastern Phoebe > which was frequently going under the bridge, so we presumed this is a > female building a nest. Every time she flew, she was chased by another > Phoebe, which we presumed was a male. This bird has the plumage pattern of > a Black Phoebe, but the dark areas are not as black as a usual Black > Phoebe, but it called a single note Black Phoebe call. We are unsure > whether this is an unusual plumaged Black Phoebe or, more likely in our > opinion, a hybrid Black/Eastern. After we had been there about half an > hour, we first heard the usual two note Eastern Phoebe song, and then saw > east of the bridge an Eastern Phoebe making this song. We believe only the > males sing, and so presumed this is a male Eastern Phoebe. Our conclusion > is there are 3 Phoebes there: a pair of Easterns plus a hybrid male > Eastern/Black Phoebe, which could possibly be an unusual Black Phoebe. > > This situation is very similar to when the Black Phoebe first showed up at > the 75th Street bridge over Boulder Creek. There was a pair of Eastern > Phoebes already established there, and the Black Phoebe chased the presumed > female Eastern Phoebe all the time. The Black Phoebe has been there last > spring and this spring, but there have been no Eastern Phoebes there, and > we presume they got fed up with the Black Phoebe intrusive behavior and > moved to a new location. > > Some photos of these birds are attached. > > Peter Gent and Peter Burke, > Boulder County. > >