Date: 7/10/19 7:13 pm
From: andrew melnykovych <estiles74...>
Subject: [cobirds] Re: Black Swift nesting failure??
Thanks for the update. One less thing to worry about..... They are
fascinating birds.

On Monday, July 1, 2019 at 6:52:40 AM UTC-4, Erik Hendrickson wrote:
> I believe this is consistant with obervations of Black Swifts at Black
> Canyon from 1996-2017, as reported in "Breeding Phenology and Success of
> Black Swifts in Box Canyon, Ouray, Colorado" in the Wilson Journal of
> Ornithology, Vol. 119, No. 4, pgs. 678-685, 2007 by Sue E. Hirshman,
> Carolyn Gunn and Richard G. Levad. Since publication of the original
> article, my understanding is that Sue Hirshman continues to closely monitor
> and record data on nesting swifts at Box Canyon, and Dr. Carolyn Gunn works
> with the data to update statistics (and continues to publish scientific
> papers about Black Swifts). The updated statistics were presented by
> Carolyn Gunn at the 2019 Ute Mountain Mesa Verde Birding Festival, and
> included the following:
> Egg Laying - mean June 28 (range June 15 to July 22, n = 118)
> Incubation Onset - mean July 1 (range June 16 to July 23, n = 131)
> At her presentation, I recall Carolyn Gunn commenting that Black Swift
> eggs can remain unattended after laying for several days, and the eggs will
> not addle, and will remain viable.
> As Rich Levad said - this is the coolest bird.
> On Wednesday, June 26, 2019 at 7:17:02 AM UTC-6, andrew melnykovych wrote:
>> All-
>> Visited Box Canyon Falls Park in Ouray today - once in mid-afternoon and
>> again at around 7 pm.
>> Located 4 nests - one empty and three with single eggs. All were
>> unattended throughout both times I was there. That is consistent with what
>> the woman at the park visitor center told me has been the case for several
>> days. I would assume that the eggs are unviable as a result.
>> Does anyone know what might have cased all these nests to be abandoned?
>> My guess is that the unusually cold and wet weather in the last few weeks
>> has impacted their favored prey (flying ants, according to Birds of America
>> Online) and that the food shortage has caused the nest abandonment. (BofA
>> has no info on nest abandonments)
>> Would be interested in everyone's thoughts.
>> I later saw at least two Black Swifts above the town at about 730 pm.
>> They were high up, far above a large flock of Violet-green Swallows. So at
>> least a few birds are around, if not necessarily nesting.
>> Andrew Melnykovych
>> Louisville KY

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