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 / 4 497 B A J A C A L I F O R N I A P E N I N S U L A one along the transpeninsular highway 8-32 km n. of the state line 24 Mar (†HMR). We still know little of the migratory tim- ing of many species in our Region. A West- ern Wood-Pewee reported near San Antonio de la Sierra 28 Mar (VAP, NA) was just ahead of known schedules in California but may be typical for the Cape district's endemic sub- species. Cassin's Kingbird has established a pattern of occasionally lingering on the win- tering grounds in Baja California Sur; singles were at Los Barriles 13 Jun and nearby Sali- nas Punta Colorado 10 Jun (both CL, DL). A Purple Martin at Laguna Hanson 18 Jul (BCS) and two reports from La Paz in Jun/ Jul were the only ones for the combined seasons—this for a species thought to nest in wide swaths of the Region. In an area birded as little as ours, it is hard to know when the lack of observer coverage is to blame and when we are watching the dis- appearrance of an imperiled and relatively conspicuous species such as this. The lack of recent/current systematic surveys of the Sier- ras de Juárez and San Pedro Mártir is only part of the problem for the martin, which is thought to have nested in desert areas almost the length of the peninsula. Perhaps related, perhaps not, Cliff Swallow was unreported in Baja California Sur for the entire period. in the area earlier in the winter. Most unusual among hundreds of shorebirds (primarily large species) believed summering at Bahía San Quíntin 24 Jun were 8 Sanderlings (RAE, SNGH, EDZH). Seven Stilt Sandpipers at the Guerrero Negros saltworks 29 Apr (GM) may have wintered locally. Long-tailed Jaeger was reported from the se. portion of the Region: 4 near Isla Cerralvo 18 Apr (ES) and 2 at Gorda Bank 30 May (ph. GM). A Common Murre was in the far north at La Fonda 22 Apr (CH). Franklin's Gulls nearly spanned the length of the Region, with one at Lagunita El Ciprés 14 Apr (ph. CH) and one at Gorda Bank 10 May (GM). Noteworthy terns included 2 Gull-billed Terns at Lagunita El Ciprés 30 Apr (EDZH), 500 Black Terns at the Guer - rero Negro saltworks 30 Apr (LFM), and an unusual number of Common Terns in spring. At least 20 were seen in Mar at five locations from Guerrero Negro to Estero San José, with 2 still present at La Paz 10 Apr (GM). DOVES THROUGH FINCHES Doves continue to be seen at sea, with a Mourning Dove riding a ship southward along approximately the s. third of Baja California Sur 30 Mar (RT) and a Eurasian Collared-Dove riding for a much shorter dis- tance along the cen. Baja California coast 26 Jul (AEM, JM). Burrowing Owls at Lagunita El Ciprés (nest with young 22 May; MJB et al.) and the Guerrero Negro saltworks (one 28 Apr; GM) were at locations known to be occupied recently, but 2 on the Magdalena Plain 31 May (TH) were not. Similar to oc- currences in the Anza-Borrego Desert of s. California, and suggesting a family group, 6 Long-eared Owls flushed from tamarisk trees at Calamajué 28 Jun (BS). There have been remarkably few Regional records in recent years. Vaux's Swift was better repre- sented than usual this spring: 200 were at La Misión 22 Apr (CH), and late birds were in the Cape district at Estero San José 9 May (3; GM, JEG) and Cabo San Lucas 30 May (GM). A Black-chinned Hummingbird at Bahía Concepción 26 Mar (†HMR) was unusual in Baja California Sur, but a reported Allen's Hummingbird at Nopoló was undocumented. The latter species remains undocumented in the state. In far nw. Baja California, suc- cessful nesting by the sedentary sub- species of Allen's Hummingbird was documented at Real del Mar, where a bird was seen collecting nest material the previous Oct: fledged young 19 Feb and nest with young 11 Apr (ph. RAE). Crested Caracara was seen again in extreme sw. Baja California, with was a Manx Shearwater just s. of Isla Santa Margarita 1 Mar (ph. PJD), the first for Baja California Sur and the first photographi- cally documented in the Region. Additional Nazca Boobies were at Cabo San Lucas in Apr (2, MVB) and Gorda Bank 30 May (ph. GM). In the far north, up to 2 Blue-footed Boobies were seen at Islas Coronado through 4 Apr (DWP) and a Magnificent Frigatebird at the Lower Nine Mile Bank 21 Jun (JAM). Neotropic Cormorant records are acumu- lating in Baja California. Two were at Bahía San Luis Gonzaga 1-3 Apr (ph. GRC). Also on the n. gulf coast, a Great Egret on Isla Angel de la Guarda 14 Apr (CJN) may be the first recorded there (see Cody, M. L., and E. Velarde. 2002. Appendix 10.6 in: A New Is- land Biogeography of the Sea of Cortés. Oxford University Press). Remarkable on the busy Maneadero Plain was a Northern Harrier nest with 5 young found 22 May (ph. MAMD et al.). A Broad- winged Hawk at San Antonio de la Sierra 17 Apr (ph. GE, AW) was probably one of 2 seen Long-tailed Jaeger has been recorded in good numbers off Baja California Sur in recent years. This was one of two at Gorda Bank 30 May 2015. Photograph by Gerardo Marrón. This Manx Shearwater (top) south of Isla Santa Margarita, Baja California Sur 1 March 2015 was the second to be photographi - cally documented in Mexico. Photograph by Peter J. Dunn. This Neotropic Cormorant at Bahía San Luis Gonzaga 1 April 2015 was one of only five ever found in Baja California. Photograph by Gorgonio Ruiz-Campos. One of the highlights of a prolonged survey of the birds of Isla Jerónimo was this Nazca Booby on 20 June 2015, only the second to be found in Baja California. Photograph by Mayra L. García.

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