Adult, non-breeding plumage. Bolsa Chica, Orange County, 9-5-09. ©
John  C. Avise.

Black Tern

Chlidonius niger

Charadriiformes, Laridae

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Adult, non-breeding plumage. Bolsa Chica, Orange County, 9-5-09. © John  C. Avise.

Adult, non-breeding plumage. Bolsa Chica, Orange County, 9-5-09. © John  C. Avise.

Adult, non-breeding plumage. Bolsa Chica, Orange County, 9-5-09. © John  C. Avise.

Adult, transitional plumage. Bolsa Chica, Orange County, 9-09. © John  C. Avise.