Mexican species

       
Royal Tern (Thalasseus maximus)
Mexico The Mexican Republic Aguascalientes Baja California Guadalupe Baja California Sur Campeche Chiapas Chihuahua Coahuila Colima Revillagigedos Revillagigedos Ciudad de México Durango Guanajuato Guerrero Hidalgo Jalisco México Michoacán Morelos Nayarit Tres Marías Nuevo León Oaxaca Puebla Querétaro Quintana Roo Cozumel San Luis Potosí Sinaloa Sonora Tabasco Tamaulipas Tlaxcala Veracruz Yucatán Zacatecas
Subspecies
Monotypic: Breeds coastal southern California and Gulf of California to Sinaloa and Islas Tres Marias, and Atlantic from Virginia southward to Florida, Gulf of Mexico to s Texas, and Caribbean including peripheral islands southeastward to French Guiana, and disjunctly coastal southern Brazil, Uruguay, and east-central Argentina.
Endemic status
Sound Guide
Comment In general the literature says that adult birds don't acquire full alternate plumage until March-April. This is not the case with birds on the Pacific coast around Colima. Here I see a large percentage of birds with a full dark crown already in January-February.
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