This week’s photo, taken October 8, 2017 on San Cristobal Island in the Galapagos, Ecuador, features a MANGROVE YELLOW WARBLER, a common bird in the Galapagos that is a subspecies of Yellow Warbler, a common warbler of the United States and Canada. The “Mangrove” subspecies that resides year-round in the Caribbean and Central and South America often has a chestnut-colored crown (as in this photo), and sometimes the entire head is dipped in chestnut.
In 2009 a Mangrove Yellow Warbler with an entirely chestnut-colored head was discovered next to a freeway in an industrial area of San Diego, California. On the day that I showed up to see this extremely rare visitor, it was causing so much excitement in the San Diego birding community that the police showed up to determine why so many people were gathering in that area.
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