North American Birds

VOLUME 68 NO4 2015

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/605532

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V O L U M E 6 8 ( 2 0 1 5 ) • N U M B E R 4 531 C o lo r a d o & W yo m i n g matic and poorly documented, with virtually no hard evidence. Faulkner (2010) notes one purported specimen, and the Wyoming Atlas (Wyoming Game & Fish Department 2012) notes them as confrmed breeders in three lati- longs, suspected in two, and observed in one but without any B.R.C. accepted records (al- though the Committee did recently accept a re- cord from Uinta). Thus an individual detected vocalizing near Shoshone Lake, Yellowstone, Teton 27 Jun (Z. Zabriskie) and heard on sev- eral occasions afterward provided a rare well- documented report. The 8 calling Long-eared Owls along Fosset Gulch Rd., Archuleta 4 Jun (SGM) made for a superb tally. Though with little in the way of documen- tation, Lesser Nighthawk has been reported in late spring and summer at Nucla, Montrose for nearly a decade. This season was slightly different in that one bird (of the multiple re- ported) was documented to the C.B.R.C. 8-11 Jun (†KMD, †MH, †M. Kiessig). Interestingly, 3 were documented from Totten Reservoir 5 Jun (SGM). Southwestern Colorado is so lightly birded that even a sizable breeding population could go virtually undetected. A fock of at least 8 Chimney Swifts at Casper, Natrona 23 Jun (ZH) was westerly for Wyoming. Colorado's frst record of Ruby-throated Hummingbird was of a summer occurrence (13 Jul 1991), but none of the next 20 accepted records came from that season. Thus, the ad. female at Cheraw, Otero 29 Jul (†SGM) was doubly interesting. Black-chinned Hummingbird con- tinued its rapid expansion of range in e. Colo- rado northward and uphill and consolidated its recent hold on the Denver metro area; the main front is now draped across Boulder, Clear Creek, Park, and Summit. In Wyoming, where the species has been restricted to the sw., four reports from Fremont; singles in Johnson, Sheri- dan, and Washakie; and three from Teton where they are almost regular provided indications that the species is also making inroads in that part of the Region. Stronger documentation on these reports would help substantially in un- derstanding this phenomenon. A Broad-tailed Hummingbird reported from the Black Hills in Crook 18 Jun (KC) added to about three other reports from the area. A Rufous Hummingbird was far e. at Pritchett, Baca 26 Jul (J. Dennis). Even though the species is assumed to breed in the area, a nesting report of Lewis's Woodpeck- ers from Red Canyon, Fremont 22 Jun (JA) pro- vided a frst confrmed breeding record for that Wyoming latilong. The rare trifecta of wood- peckers continued at/returned to the Hayman Burn, Jefferson, with Lewis's, Red-headed, and Acorn there during much of Jun (m.ob.), pro- viding birders chances at a nine-woodpecker day. Three reports of Williamson's Sapsucker came from the s. portion of the Laramie Range, Albany 15 Jun–22 Jul (VS, DJ, T. Gannon), where the nature of their occurrence remains uncertain. All records included photographs and involved at least 4 birds, one a juv. male. While Eastern Downy Woodpecker continues to push the w. edge of their range—reports from the Front Range edge in Jefferson, Boulder, and Larimer—much rarer was a Rocky Moun- tains Downy on the plains at Barr 17 Jun (CS). An intergrade ficker was far w. at Carpenter Ranch, Routt 18 Jun (SGM), while seasonally rare was a Peregrine Falcon on the Plains at Greeley 11 Jun (SGM). FLYCATCHERS THROUGH MIMIDS Wyoming's second Eastern Wood-Pewee spent 28 Jun–28 Jul at Ocean Lake, Fremont (SGM, ZH). The second-Boulder-record Black Phoebe present along Boulder Creek at 109th St. 3-18 May apparently moved nearly 5 km w. along the creek to 75th St. for 31 May–20 Jul. The latter site had hosted a potentially nesting pair of Eastern Phoebes 12 Apr–6 May, but only one was seen 12 May–20 Jul (m.ob.). Although an Ash-throated Flycatcher near Torrington, Goshen 23 Jun (SB, DL) would normally be considered signifcantly e. of range and was a frst for the latilong, the possibility of breeding at the relatively nearby Hartsville Uplift (see S.A. in previous season's report) might put this bird closer to home than expected. Even more out of range, though, was a well-described in- dividual from the Black Hills region at Devil's Tower N.M., Crook 22 Jul (K. Smith). This would be a frst for anywhere in the Black Hills region, either for Wyoming or South Dakota (J. S. Palmer, pers. comm.). Pairs of Eastern King- birds were reported in Jun from two locations in Yellowstone, one each in Park and Teton (A. Mouakad, P. Chaon), where considered rare, Sa Until recently, Willow Flycatcher was unknown on the Plains as a breeder (Andrews and Righter 1992, Kingery 1998), but reports have been piling up in recent summers, particularly from Logan, from which half of this season's sightings originate: single birds 12 Jun at both Tamarack and Jumbo Reservoir (SGM). Yuma got into the action, too, with one at Hale Ponds 17 Jun (SGM, N. Moore). Of interest would be determining to which subspe- cies, Eastern traillii or Northwestern adastus, these birds are referable. While the former is unknown as a breeder here, it seems the more likely considering geography and the host of other e. taxa extending their ranges into that corner of Colorado. However, 2 apparently ter- ritorial males at Ball Reservoir 1 Jun (MPe, SGM) were much farther west, thus confusing the situation greatly. Willow Flycatchers 24 Jul at Prewitt and 29 Jul at Lamar (both SGM) were probably early fall migrants. Least Flycatcher has been providing food for thought in both states for some time now. The species has spottily colonized the West Slope, and a male singing at Gypsum, Eagle 15 Jun–18 Jul (J. Riggle) seemed to be trying to extend that phenomenon. In w. Wyoming, the species was documented from Jackson Hole, Teton, where the species is considered very rare, for the fourth consecutive year, on 16 Jun (ph., v.r. BO); 2 other birds were noted there 30 Jun (C. Winstanley). Other sightings of interest included one carrying nest material at the Fontanelle Migrant Trap, Lincoln 20 Jun (MF), and three reports from Fremont: 3 at Ocean Lake 28 Jun (SGM) and singles at Lander 16 Jun–30 Jul (JA) and Sinks Canyon 13 Jun (AG). Early fall migrants were noted in Colorado at two Prowers sites 29 Jul (SGM) and at Crow Val- ley (along with an early Dusky Flycatcher) 31 Jul (DD). Early June regularly sees a few boreal- and Arctic-breeding shorebird species straggling into early June in the Colorado and Wyoming region, with White-rumped Sandpiper being the most numerous due to its very late spring schedule. Late individuals of other species are typically frst-cycle individuals, often sporting little in the way of breeding plumage. One of the more infrequent such species is Long-billed Dowitcher, with eBird frequency of less than 0.07% in Colorado and less than 0.12% in Wyoming in the frst half of June, versus early May peaks of 6.5% and 5.6%, respectively. Thus, this brightly plumaged bird was doubly a surprise 8-11 (here 8) June 2014 at Lower Latham Reservoir, Weld County, Colorado. Photograph by Cathy Sheeter.

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