North American Birds

VOLUME 69 NO3 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

Issue link: http://nab.aba.org/i/778845

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V O L U M E 6 9 ( 2 0 1 6 ) • N U M B E R S 3 / 4 449 C O LO R A D O & W YO M I N G al.; A. Bankert, M. McCloy) and at Lake Meredith, Crowley 8-9 May (N. Komar et al.). However, the duos seen 18 Apr and 9 May at Neesopah may well have been different birds, as, except for a sin - gle seen there on 1 May, there were no other reports of the species from the lo - cation this season. Three one-day-won- der singles were noted in Denver, Weld, and Rio Grande 18 Apr–17 May. With wintering gull species added to the regular spring migrants (Bonaparte's, Franklin's), a Laughing Gull made for a seasonal Colorado larid tally of 12 spe - cies. An ad. Arctic Tern graced Timnath Reservoir 24-29 May (D. Wade); only six of the previous accepted 23 Colorado records (through 2014) were from spring (24 May–18 Jun). For the fourth out of the past five springs, White-winged Dove made its presence known in Wyoming, with one at Basin, Big Horn 11-15 Mar (J. & N. Miller) providing a first latilong record and a flyby recorded near Wheatland, Platte 20 Mar (SB, LM). A Common Ground- Dove photographed at Paonia, Delta 13 May (†J. Beason) would provide the first accept - ed West Slope and sixth Colorado record. A Black-billed Cuckoo (less than annual in Colorado) was noted at Chico Basin Ranch, El Paso 25 May (†BKP). A Western Screech-Owl seen and heard on 8 Mar in Cache Canyon, Teton (K. Michael) provided a rare well- documented report of a species that remains enigmatic in Wyoming. Colorado's overdue first well-documented Vaux's Swift foraged with swallows over the Arkansas River near Pueblo Reservoir, Pueblo 28 Apr (acc.; ph. BKP). A male Ruby-throated Hummingbird s. of Lamar, Prowers 4-5 May (J. Stulp) added to a rapidly increasing Colorado tally of re - cords. A Pileated Woodpecker at Mammoth Hot Springs, Yellowstone N.P., Park 30 May (K. Maloy) provided a first Wyoming spring record of this enigmatic species. PASSERINES Eastern Wood-Pewee (19-22 May) and Yellow-bellied Flycatcher (21-23 May) were documented twice each in Colorado. A male Vermilion Flycatcher was seasonally unique 5 Apr in Pueblo (P. Sandstrom-Smith, C. Smith), while single Scissor-tailed Flycatchers were noted in five e. Colorado counties 1-30 May. Single Blue-headed Vireos graced Baca, El Paso, and Jefferson 3-23 May (JK, D. Tønnessen, M. Chavez). A Northern Rough- winged Swallow n. of Lander, Fremont 9 Apr (BH) was record early in Wyoming by nine days. Early Marsh Wrens were noted 10 Mar at Ocean Lake, Fremont (Del Nelson) and 15 Mar at Gelatt Lake, Albany (SB); whether these were wintering birds or early spring migrants is unknown. A Bewick's Wren photographed s. of Laramie 11 Apr (SB, LM) was record early in Wyoming by six days and provided only the second Albany report. Single Swainson's (Russet-backed) Thrushes were in Bent 19 May (SGM) and in Boulder 21 May (N. Moore). Record early by eight days in Wyoming was a Hermit Thrush at Laramie 9 Apr (D. Eddy, C. Porter). Wyoming's sixteenth Wood Thrush visited Edness Kimball Wilkins P.P., Natrona 10 May (Z. Harrison). A Northern Mockingbird at Laramie 15-22 Apr was about a month early and rode out quite a storm (CB). Two Blue-winged Warblers (28 Apr and 13 May–17 Jun) were outclassed by the re - markable 4 Golden-winged Warblers (25 Apr–23 May); a Brewster's Warbler (21 May) Daniel, Sublette, WY (E. Boehm). Record early in Wyoming were a Sora near Casper, Natrona 13 Apr (S. Scott); a Black- necked Stilt at Gillette, Campbell 6 Apr (M. McCormack) and 2 at Cody, Park (J. Hoar); and a Willet at Woodruff Narrows, Uinta 4 Apr (J. Whitmore). An American Golden-Plover in Goshen 16-23 May (SB, LM) added to just over a dozen Wyoming spring reports. An Upland Sandpiper heard repeatedly at Seedskadee N.W.R. 26 May (T. Koerner) provided a Wyoming latilong first and likely a Sweetwater first. Hudsonian Godwits were documented from sw. Weld 1-8 (B. Righter) and near Hasty, Bent 4-9 May (J. Drummond). The Adams Dunlin found on the last day of the previous season had probably wintered locally, a very rare Regional event, and was noted through 12 Mar (m.ob.). The Dunlin show continued, with at least 9 additional birds in Colorado. Two each were at John Martin Reservoir 18 Apr (JK et al.) and nearby Verhoeff Reservoir 22 Apr (DAL, J. Thompson), both in Bent . Up to 2 were at Neesopah Reservoir, Kiowa 18 Apr–9 May (A. Hopping, D. Dowell; JK et In spring 2015, Wyoming had three records of Summer Tanager, adding to about two-dozen previous records. This bird was at Jackson, Teton County 12 May. Photograph by Valerie Crawford. Wyoming enjoyed two first latilong records of Scarlet Tanager in spring 2015. This bird was at Laramie, Albany County 11-12 (here 11) May. The state has just 19 previous records of the species. Photograph by Shawn Billerman. SA A mid-Apr snowstorm that hammered Wyoming led to some phenomenal roadside bird concentrations, along with several instances of small passerine predation by West - ern Meadowlarks. On 16 Apr, Nathanial Behl, Cody Porter, and Doug Eddy explored the results of the storm near Lara - mie, Albany and in several areas discovered large concentra- tions of birds, including totals of 10,000+ Horned Larks and 1300 McCown's Longspurs (both recent record tallies for the state). During their study, they documented at least 35 cases of Western Meadowlarks eating other birds, including three instances where they actually witnessed meadowlarks at - tacking and killing birds. The most common prey items were Horned Larks and McCown's Longspurs, but American Robins and other Western Meadowlarks were also consumed. A Eu - ropean Starling and a Horned Lark were also seen scavenging carcasses. For two days near Cheyenne, Laramie, Jan McKee witnessed Western Meadowlarks actively hunting and killing Dark-eyed Juncos around her feeders during the storm. Nathanial Behl, Cody Porter, and Doug Eddy studied the impacts of a snow storm on birds around Laramie, Albany County, Wyoming 16 April 2015. They observed Western Meadowlarks scavenging on the remains of road-killed passerines and also attacking and killing small birds. Photograph by Nathaniel Behl. Following a powerful spring blizzard in Wyoming, this Western Meadowlark was found dead Cheyenne, Laramie County 17 April 2015, the prey item below it a Dark- eyed Junco. Photograph by Jan McKee.

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