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.

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Page 187 of 211

N O R T H A M E R I C A N B I R D S 498 B A J A C A L I F O R N I A P E N I N S U L A la-Pérez, Mark J. Billings, Quentin Brown, Courtney Cameron, Matthew Cameron, Peter J. Dunn, Morgan Edwards, Gavin Em- mons, Richard A. Erickson, Henry J. Fandel IV, José Emer García, Mayra L. García, Bren- da Guzman, Tom Haglund, Scott Hall, Chris Harbard, Alan Harper, Adriana Hernández Alvarez, Ana Jacinto, Frank Lambert, Chris Llewellyn, Debbie Llewellyn, Roger Lucken- bach, Rob Larson, David MacKay, Gerardo Marrón, Marco Antonio Martínez Damián, Bob Martinka, Amy E. McAndrews, Luis F. Mendoza, Jorge Montejo, John A. Morgan, Carlos J. Navarro, David W. Povey, Harold M. Reeve, Gorgonio Ruiz-Campos, Brian Sandstrom, Brad C. Singer, Gary J. Strachan, Elaine Swank, Rick Taylor, Mark Van Beirs, Jonathan Vargas, Nigel Voaden, George Wallace, Alacia Welch, Enrique D. Zamora- Hernández. Records submitted to and ac- cessed from eBird/aVerAves were essential in the compilation of this report. N –––––––––––––––––––––––––––––––––––––– Richard A. Erickson, LSA Associates, 20 Executive Park, Suite 200, Irvine, California 92614 ( Roberto Carmona, Departamento de Biología Marina, Universidad Autónoma de Baja California Sur, Apartado Postal 19-B, La Paz, Baja California Sur, México ( Gorgonio Ruiz-Campos, Facultad de Ciencias, Universidad Autónoma de Baja California , Km. 103 Carretera Tijuana-Ensenada, Ensenada, Baja California, 22800, México U. S. MAILING ADDRESS: PMB 064, P.O. Box 189003, Coronado, California 92178-9003 ( in the lower Sierra San Pedro Mártir at Mike's Sky Ranch 21 Mar (ph. GRC), and the last of the winter's exceptional Varied Thrush showing was one in Ensenada the same day (EDZH). Adding to the small number of sum - mer Yellow-breasted Chats seen in the s. Cape district was one at Salinas Punta Colorado 10 Jun (CL, DL), the first seen there by these long-time observers. Two Black-chinned Sparrows on the wintering grounds at Isla Es - píritu Santo 21 Mar (BM) were more than a month after the first 4 early birds were found singing on territory at Tecate 16 Feb (RL). The only Lark Buntings reported were at La Paz 27 Mar (6; GM, YAC), Bahía San Luis Gonza - ga 1-3 Apr (23, ph. GRC), and in the foothills e. of San Telmo 17 Apr (6, CH). Lingering winterers in s. Baja California Sur included a Green-tailed Towhee and 2 Lark Sparrows in the foothills of the Sierra de La Laguna 1-3 May (FL, NV) and a Black-headed Grosbeak at Estero San José 9 May (GM). Great-tailed Grackles away from traditional localities were 15 at Bahía San Luis Gonzaga 1-3 Apr (ph. GRC) and one at Mike's Sky Ranch 30 Apr (AH). Noteworthy orioles included a Bull - ock's Oriole at Santiago 27 Mar (VAP, NA), rare in Baja California Sur; a Baltimore Oriole at La Misión 23 Apr (ph. CH); and best of all, a Streak-backed Oriole at San Javier 1 Apr (ph. GM, BG). Given the paucity of recent Regional reports, single Red Crossbills in the Sierra San Pedro Mártir 23 Jun (RAE) and the Sierra de Juárez 18 Jul (BCS) were surprising. Contributors: Yanet Aguilar-Contreras, Nallely Arce, Thibaud Aronson, Víctor Aya- In contrast, Northern Rough-winged Swal - low is now reported much more widely in Baja California Sur than previously, where a pair was seen copulating at Estero San José 9 May (GM). Other swallow observations of note included 2 late Tree Swallows at Todos Santos 24 May (GM) and a Bank Swallow at Lagunita El Ciprés 24 Apr (EDZH). The status of nesting Marsh Wrens in nw. Baja California remains poorly known. Indi - vidual birds in suitable habitat 22 May were at El Descanso and Lagunita El Ciprés (MJB et al.). A Townsend's Solitaire was unexpected SA Islands are typically important biologically far beyond their size, and our Region has many of these important places. Mayra L. García spent much of the spring and summer on the small Pacific island of San Jerónimo, s. of El Rosario, in the employ of Grupo de Ecología y Conservación de Islas (GECI). While there she made many dis- coveries, including the following, which are apparent "firsts" for the island (cf. Erickson and Palacios et al. 2010. Avifauna de las islas del Pacífico frente al norte y centro de la península de Baja California, in: Islas de México, Un Recurso Estratégico. Instituto Nacional de Ecología, D. F.): Red-throated Loon, Clark's Grebe (first for any Pacific island), Black- vented Shearwater, Nazca Booby (20 Jun, the second record for Baja California), Mag- nificent Frigatebird (max. 12 on 18 Jul), Great Egret (examining Cassin's Auklet burrows), Snowy Egret, Long-billed Curlew, California Gull, Glaucous-winged Gull, Caspian Tern (first nesting for any Pacific island), Royal Tern (first nesting for Jerónimo), Elegant Tern, Guadalupe Murrelet, Lesser Nighthawk (12 & 31 May), Anna's Hummingbird, Costa's Hummingbird, Pacific-slope Flycatcher, Black Phoebe, Scissor-tailed Flycatcher (5 May), Violet-green Swallow (first for any Pacific island), Black-and-white Warbler (12 May), Tennessee Warbler (12 Jun), Orange-crowned Warbler, Yellow Warbler, Audubon's War- bler, Townsend's Warbler, Hermit Warbler, American Redstart (7 May), Wilson's Warbler, White-crowned Sparrow, Brown-headed Cowbird, Eurasian Collared-Dove, House Spar- row. Unusual summer shorebirds included Wandering Tattler (up to 3, 9 Jun–6 Jul) and Surfbird (one 30 Jun–31 Jul). Up to 10 roosting Pelagic Cormorants were also of interest. Fox Sparrow has been known to nest in the Sierra San Pedro Mártir of northern Baja California since the early 1990s. Although the birds appear to match the subspecies stephensi of southern California, no specimens are known from the area and no formal taxonomic analysis has been prepared. This bird was singing near the national park entrance on 23 June 2015. Photograph by Steve N. G. Howell. Lark Bunting no longer occurs on the Baja California Peninsula in the numbers that it once did. This bird was at Bahía San Luis Gonzaga 1 April 2015. Photograph by Gorgonio Ruiz-Campos.

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