Checklist S55476303

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Owner Ted Floyd

  • 20
  • 3.5 mi
Checklist Comments

With participants in a University of Denver ornithology class. We walked the entire outer perimeter, clockwise. After some morning sunshine and warmth, the clouds rolled in, and the wind picked up; it was pretty chilly out there much of the time. Temp steady in upper 40s, with a variable wind--east & north. Saw several painted ladies (photo,; cabbage whites were out in full force. Heard western chorus frogs at several junctures. The purple mustard, Chorispora tenella, was pretty much all bloomed out; however the purple geranium, Erodium cicutarium, was still going strong. Purple Rain!


  1. Number observed: 30

    Details: Pairs everywhere. No goslings yet. Saw many birds sitting on nests. Also, saw several abandoned eggs on islands in Cottonwood Marsh. Per eBird protocol, eggs not counted in estimated number of birds present.

  2. Number observed: X

    Details: By this date, all presumed to be this taxon.

  3. Number observed: 1

    Details: A drake gave us a nice flyby along Boulder Creek just north of the sewage treatment plant.

  4. Number observed: 4

    Details: 2 pairs, Cottonwood Marsh.

  5. Number observed: 2

    Details: 2 drakes, Cottonwood Marsh.

  6. Number observed: 30

    Details: Nearly all were in the Rickey Weiser wetland.

  7. Number observed: 2

    Details: Pair, Rickey Weiser wetland.

  8. Number observed: 15

    Details: Scattered throughout; all hen-types were scrutinized for Mexican Duck (none of which were detected).

  9. Number observed: 1

    Details: hen, Cottonwood Marsh.

  10. duck sp.

    Number observed: 2

    Details: Distant ducks in the glare, Cottonwood Marsh.

  11. Number observed: 2

    Details: The big power pole gang was gone! What's up with that? However, 2 were still hanging on at Cottonwood Marsh, north side.

  12. Number observed: 20

    Details: Throughout, including multiple songsters. Strange to detect NO Eurasian Collared-Doves!

  13. Number observed: 1

    Details: With three Gadwalls, Long Pond, Sawhill.

  14. Number observed: 1

    Details: Nice, noisy flyover--Sawhill side. Then one at Cottonwood, at the end. The same bird?

  15. Number observed: 10

    Details: Throughout, mostly singles. Are they on "nests" already?

  16. Number observed: 1

    Details: One winnowed--wildly and just once, just over our heads as we walked past Duck Pond. It was pretty low as winnowing snipes go. I have no interpretation for this behavior! So odd for it to do it just once, and so low, and in broad daylight.

  17. Number observed: 1

    Details: One stopped at Sawhill, back end.

  18. Number observed: 20

    Details: An even 20 on the exposed snags at Cottonwood Marsh, mix of SYs & ASYs. Saw a few singletons elsewhere, but I think they could have dispersers from this Cottonwood Marsh group.

  19. Number observed: 5

    Details: Including one carrying an impressive distance--and at considerable height. These seemed to be aloft continually, but I think there were probably a lot of repeats. So we'll say n=5.

  20. Number observed: 2

    Details: One was near (but not at) the nest platform, back end of Sawhill; the other was much farther out, practically to Valmont Reservoir.

  21. Number observed: 1

    Details: A large immature (female?) flew straight over Duck Pond, then up into a tree near the excavation site, where it was aggrieved by Common Grackles.

  22. Number observed: 1

    Details: Adult on one of the tall pinkish utility poles, Cottonwood Marsh - Wally Toev's. The first bird we saw!

  23. Number observed: 1

    Details: An intermediate-morph bird seen high above the Cottonwood Marsh parking area as we were leaving; likely a bird on "vis mig."

  24. Number observed: 3

    Details: Adults, all enjoyed at reasonably close range as wheeled about in fairly tight circles.

  25. Buteo sp.

    Number observed: 1

    Details: Likely a Swainson's Hawk; a very distant bird, seen from near Boulder Creek & 75th.

  26. Number observed: 3

    Details: Widespread rattlers, including one that flew straight over along Boulder Creek near Jay Rd.

  27. Number observed: 1

    Details: Heard from the Cottonwood Marsh parking lot.

  28. Number observed: 4

    Details: Distant and/or not-seen birds.

  29. Number observed: 2

    Details: A pair on the solar panels, studied at close range, were assignable to this taxon.

  30. Number observed: 1

    Details: A male seen on distant wires near the solar farm.

  31. Number observed: 5

    Details: Widespread around Cottonwood Marsh and along Boulder Creek.

  32. Number observed: 25

    Details: One of the best Blue Jay presences I've ever seen in Boulder County. We saw several groups of 5+ migrating over, plus singles and 2s and 3s throughout. I imagine most of these were migrants.

  33. Number observed: 3

    Details: Three in the general vicinity of north Walden, Boulder Creek along Jay Rd.

  34. Number observed: 1

    Details: Heard one near the junipers, Rickey Weiser wetlands.

  35. Number observed: 2

    Details: One was hanging out on the big dirt piles; another was flyover

  36. Number observed: 10

    Details: Widespread, including a few songsters. We saw several pairs around old willows and cottonwoods, perhaps nest sites.

  37. Number observed: 3

    Details: Two over the trees, back end of Sawhill; and another at the northwest side of Walden (Rickey Weiser).

  38. Number observed: 15

    Details: Widespread, but with a primary concentration over Cottonwood Marsh.

  39. Number observed: 5

    Details: A decent-sized flock over the tall trees, back end of Sawhill; 5 is a minimum, maybe more like 8-10.

  40. Number observed: 7

    Details: Mostly at Cottonwood Marsh--high-flying chatterers, plus 1 or 2 around there dirt piles (where they have likely bred in recent years).

  41. Number observed: 25

    Details: This was the dominant swallow species, aloft in small numbers practically all morning long. We saw small numbers over most ponds, including 10+ over Cottonwood Marsh.

  42. Number observed: 3

    Details: We saw two over Cottonwood Marsh, then one at the Sawhill back end.

  43. Number observed: 1

    Details: One at the back end of Sawhill was giving "yank yank" calls that I thought could have been Eastern (carolinensis). Two others (Sawhill back end, Bouler Creek along Jay Road seemed typical of Interior West (nelsoni).

  44. Number observed: 2

    Details: See comments under "White-breasted Nuthatch," above.

  45. Number observed: 7

    Details: This House Wren was singing near the back end of Sawhill

  46. Number observed: 25

    Details: Widespread. An interesting sight was one poking its head out of a flicker hole--a seemingly just-excavated hole, I might add. Poor flickers!

  47. Number observed: 25

    Details: Estimated count. Widespread, but not a lot of song, perhaps because of the overcast. See analysis of a particular robin, below.

  48. Number observed: 1

    Details: Heard one singing from the Wally Toev's Pond restrooms.

  49. Number observed: 5

    Details: Didn't really see very many at all, although one along Boulder Creek was at max red.

  50. Number observed: 5

    Details: Widespreading, including several songsters. At two junctures, we saw a male mostly through his prealternate (spring) molt, but still with some dull tan feathers on the nape and back.

  51. Number observed: 1

    Details: Heard one singing along the entrance road, near Cara's house. Sounded like Gambel's but I'm not sure.

  52. Number observed: 7

    Details: Widespread songsters, including one studied in detail along the Cottonwood Marsh boardwalk. Along with the audio & photo below, here's a link to a video of an odd song by this bird:

  53. sparrow sp.

    Number observed: 2

    Details: Flyovers, Cottonwood Marsh. I was thinking Lark Sparrows, but they were pretty distant, and I wasn't sure.

  54. Number observed: 1

    Details: We heard one on the walk back to Cottonwood/Toev's; probably out in the grassy area along the sewage treatment plant entrance road.

  55. Number observed: 100

    Details: Constantly within earshot, and pretty much in view continually as well. THE bird of the morning. 100 is an absolute minimum. Most were males on territory, although we saw several females + flyovers.

  56. Number observed: 5

    Details: Several flyovers (male flight call), and we got to see a male perched.

  57. Number observed: 40

    Details: Widespread, esp. males. All were -versicolor-, of course.

  58. Number observed: 2

    Details: Two Cottonwood Marsh flyovers; both sounded good for Audubon's.

  59. Number observed: 3

    Details: Three widely distributed males.

  60. passerine sp.

    Number observed: 1

    Details: A distant songster that I thought could have been a Great-tailed Grackle.

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