I have visited Dixon Reservoir in west Fort Collins several times this week. The highlights have been:
Black-headed (which would be late) or Rose-breasted Grosbeak (which would be “out of place”ish)
I only got a glance of this bird, a female, and the line above the eye was very bright, and the “chink” call had a “metallic” character, which seem to lean to Rose-breasted. I have not photos, however, so I can’t really say with any confidence which it was.
Northern Pygmy-Owl (1, holding prey)
Townsend’s Solitaire (1)
Others include:
Gray Catbird
Ruby-crowned Kinglet
Orange-crowned Warbler
Yellow-rumped Warbler
White-crowned Sparrow
Lincoln’s Sparrow
I put a few photos of the Northern Pygmy-Owl and the Evening Grosbeak at the link below. I only saw the Northern Pygmy-Owl’s lower half, as it was perched behind a branch, except for a brief moment that it looked at me. The photos only show the lower half and the prey (mouse/vole?). The photos of the Evening Grosbeak are blurry, unfortunately, but sufficient to confirm.
https://picasaweb.google.com/105742165113837247842/NorthernPygmyOwlEveningGrosbeak#