Saturday, 3 October 2020

[cobirds] Rock Wrens (?) at Rocky Mtn. Arsenal

Hi all,
Had a great day at RMA with a Lesser Yellowlegs & a Sage Thrasher being added to my 2020 list. https://ebird.org/checklist/S74362841
However, there was a 3rd bird which stumped me. I initially thought it was a Rock Wren given the long bill (too long for a Vireo), drab cream-colored breast (no stripes like a Sage Thrasher), size (slightly larger than the other Rock Wrens we saw), and eye stripe (very bold). However, it wasn't anywhere near a rock.
We saw it twice, once on top of an outhouse building, and then on some logs. It was foraging for insects and not making a sound. One interesting behavior I had not seen before in Rock Wrens: it was bobbing up and down. Not rocking, not tail flicking, it looked like it was doing deep knee bends! I have never seen this.
Later on we saw two other Rock Wrens (on rocks this time) and the eye stripe was less distinct and there was no bobbing. they also looked smaller than the bird we saw.
One last identifying feature: the bird had black and white bands on the underside of its tail.
Any help would be greatly appreciated.
Good birding,
Van Rudd
Louisville, CO

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