Folks, I visited Walden Reservoir a second time this morning and believe I found the correct loon again, this time in good light and close enough for photo documentation. In my assessment, the loon can look like either Arctic or Common depending on the bird's position. This means that in some views it had features pertaining to Arctic Loon but not Common Loon, and in other views it had traits of Common but not Arctic. In my view it should not be called either one or the other. I believe it may be a hybrid. I have changed my eBird entries for this bird to "Loon sp" and suggest other observers do the same. Does anyone know if this hybrid combo has ever been documented? If not, this discovery (if ever confirmed) would be truly novel and very exciting. New photos at
Nick Komar
Fort Collins CO
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On Jun 21, 2021, at 10:17 AM, 'Steven Mlodinow' via Colorado Birds <cobirds@googlegroups.com> wrote:
Greetings All--
I was pondering with Nick Moore success, vs lack of, in pursuit of yonder Arctic Loon.
The Arctic Loon seems to hang around (at least Saturday) back towards the far western portion of the reservoir. Walden Reservoir can be confusing. First of all, it is oriented largely north/south. Additionally, it is easy to think you are nearing the northern end when you are not.
The road along the eastern side of the reservoir is a track, mostly, sometimes requiring care due to ruts.Walden ends to the north in one last lobe bordered by (in part) a rocky rim. It is also most pinched off just before this last lobe.
The loon was best viewed just south of that "pinch," at about 40.741488 -106.319239I do wonder if some folks did not go quite far enough north. The Common Loon spent most of its time a couple of hundred yards to the south of the Arctic.
Good Luck and Good BirdingSteve
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