Bird photos - Mexico - Jesper Bay Jacobsen

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Caspian Tern (Hydroprogne caspia) ebird/Clements (2019)
	691 (2 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio Campo Mosqueda, south of Mexicali, Baja California (Bcn), Mexico 2010-11-17 Adult in basic plumage with the black but white-striped crown.
	693 (1 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio Campo Mosqueda, south of Mexicali, Baja California (Bcn), Mexico 2010-11-17 Adult preparing for a dive.
	694 (3 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio El Tortugario - Estero Palo Verde, Cuyutlán, Colima (Col), Mexico 2012-04-07 2cy bird with worn primaries and juvenile coverts on the upperside. In Mexico the species only breeds in the northern part of the Californian peninsula.
	697 (1 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio El Tortugario - Estero Palo Verde, Cuyutlán, Colima (Col), Mexico 2012-04-07 Adult with continued winter crown. In the area the species is easiest to confuse with Royal Tern. The Elegant Tern is both much rarer and much smaller than Caspian and should not be a problem. Compared to the Royal Tern the Caspian is heavier built and has the gravity point put very much forward toward the head region. It flies with softer wing beats, like a gull, and general does not appear as edgy and pointed as does Royal. The bill color is always blood red compared to the red-orange bill of Royal,and has a diffuse black marking at the tip. The black underwing is characteristic but is not always easy to see. In winter time the Caspian retains almost all of the black crown compared to Royal that always becomes pure white on the front part of the crown. This is a very good field character to separate the two species. in winter. The voice of the Caspian is also very different from the other terns. It sounds more like a hoarse heron.
	678 (1 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio Kalvebod Fælled, Amager, Denmark 2012-06-22 Adult. Breeding on Saltholm in the strait between Denmark and Sweden, Øresund, and forages frequently on Vestamager during the summer.
	1012 (1 photos) Caspian Tern (Hydroprogne caspia) monotypic Rovterne - Charrán del Caspio Presa La Vega, west of Gdl, Jalisco (Jal), Mexico 2013-06-16 Probably 3cy birds. They look adult, but none of them have a complete black cap, which the adult should have at this time of year. It looks like this locality serves as roosting site for many birds of several species that still do not breed.