North American Birds

VOLUME 70 NO3-NO4 2019

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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N O R T H A M E R I C A N B I R D S 392 B A J A C A L I F O R N I A P E N I N S U L A This was one of three Can- vasbacks at Presa Rodríguez, Baja California 18 May 2016. It remained to at least 19 July (here 16 June) to estab- lish the first summer record for the Region. Photo by © Richard A. Erickson This Semipalmated Sandpiper at the Cerro Prieto geothermal ponds 22 July 2016 was the first ever photo-documented in Baja California. Photo by © Eduardo Soto Montoya This Semipalmated Sandpiper at the Cerro Prieto geothermal ponds 22 July 2016 was the first ever photo-documented in Baja California. Photo by © Eduardo Soto Montoya Benito 28 Mar (LM) had had human assistance in reaching that outpost. Orchard Oriole was last seen at Estero San José 13 Apr (ST) and addi - tional late birds were in the foothills northeast of Todos Santos 28 Mar (RP) and at Cabo San Lucas 9 Apr (M&JG). Contributors: Peter Adriaens, Enrique Alfaro, Ron Arlinghaus, Víctor Ayala-Pérez, Mark J. Billings, Thomas P. Brown, José Juan Butrón Rodríguez, Alejandra Calvo Fonseca, Roberto Carmona, David Ismael Carmona Rivera, Rich - ard A. Erickson, Dawn Garcia, Mel and Jeanne Goff, Mike Greenfelder, Tom Haglund, Adriana Hernández Álvarez, Mark A. Holmgren, Steve N. G. Howell, Ana Jacinto, Mary Killian, Paul E. Lehman, Rob Larson, Gerardo Marrón, Marco Antonio Martínez Damián, Larry Moore, Rob - ert Parsons, David M. Pereksta, Diana Ramírez Sánchez, Pamela C. Rasmussen, Gary H. Rosen - berg, Ernesto Salmerón Pillado, Brad C. Singer, Gary J. Strachan, Shep Thorp, Jonathan Vargas, Enrique D. Zamora-Hernández. Records sub - mitted to and accessed from aVerAves/eBird were essential in the compilation of this report, and additional details on many of these records may be found there. A –––––––––––––––––––––––––––––––––––––– SUMMER 2016 –––––––––––––––––––––––––––––––––––––– N esting birds dominate the report this time, including Aechmophorus grebes and Swainson's Hawk. Tricolored Black - birds nested in good numbers but over a very limited area. A Semipalmated Sandpiper in Baja California was the first found there in 13 years. WATERFOWL THROUGH SHOREBIRDS The long-staying Canada Goose remained at the Mexicali zoo 4 Apr—16 Jun (GM et al.). A Blue-winged Teal at Lagunas de Chametla was most unexpected on the date of 16 Jun (JV). At the far north of the Region, unseasonal waterbirds included 2 Northern Shovelers at Lagunita El Ciprés 12 Jun (EDZH, AC), 15 Redheads and 15 Eared Grebes at Las Areni - tas sewage ponds 16 Jun (RAE, LRR), and 150 Eared Grebes and a Pacific Loon at the nearby Cerro Prieto geothermal ponds 17 Jun (ESM, RAE, LRR). Most unusual in this group was a Canvasback at Presa Rodríguez 16 Jun—19 Jul (ph. RAE, LRR), where three had been present 18 May. Representing species that have expand - ed northward in recent years were 3 Neotropic Cormorants at the Mexicali country club 17 Jun (ph. RAE, LRR) and at least 2 Yellow-crowned Night-Herons (possibly nesting) in the Ensena - da/Lagunita El Ciprés area 12 Jun—19 Jul (ph. EDZH et al.). Away from nesting areas were Bald Eagles near San Juanico 13 Jul (ES et al.) and near San - tiago the same month (fide DR), and a Zone- tailed Hawk at Ensenada 9 Jul (EDZH). At an incipient nesting site, a male Swainson's Hawk was on and in the vicinty of a nest in the Ojos Negros Valley 2-27 May (ph. RAE, ph. EDZH) SA Wetlands are especially important places in an arid region such as ours, and human- created wetlands are no exception. One such place is Presa Abelardo L. Rodríguez on the outskirts of Tijuana. Water levels and habitat conditions can vary greatly from year to year and conditions were very good in 2016. Most significant among the observations made by Erickson, Zamora-Hernández, and Rodriguez were approximately 250 Tricolored Black - birds that nested successfully at two locations on the lake. Nesting was also confirmed in 2002 and 2008, but did not occur in 2007 and 2013. Other species of regional conservation concern known or believed to have nested at the reservoir this year included Western Grebe (at least 1 pair), Clark's Grebe (at least 2 pairs), Least Bittern, White-faced Ibis, Bell's Vireo, Clark's Marsh Wren (C. p. clarkae), Yellow Warbler, and Yellow-breasted Chat. SA Tricolored Blackbird remains of critical conservation concern in the Region, and is over- due for official designation as endangered in Mexico. Some relief from extreme drought appeared in the northern portion of the Region this year, resulting in the largest number of nesting birds recorded since periodic surveys began in 2007. Approximately 850 birds were at three colonies, all <20 km south of the US border (RAE, EDZH, LRR). Four were at El Rosario 6 Apr (MJB) but none could be found there on 3 May (RAE, EDZH). The southernmost "popula - tion" appears to be increasingly at risk. The species has not been seen at any season anywhere else south of Héroes de la Independencia (170 km to the north) since 2012. Tricolored Blackbird nesting marsh at the recreativo at Ciénega Redonda 1 May 2016, part of one of only three nesting sites in Baja California this year. Photo by © Richard A. Erickson but a mate was never seen. The only previous nesting reported in the Region was in 1913 and 1920 (Monographs in Field Ornithology 3: 122). Unseasonal shorebirds near La Paz included 150 Semipalmated Plovers 29 Jun (JV) and

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