Cayenne Tern (Sterna sandvicensis eurygnatha)
(aka Thalasseus sandvicensis eurygnatha)
Cayenne Tern, Lagoa do Peixe, Rio Grande do Sul, Brazil, August 2004 - click for larger image Lagoa do Peixe, Rio Grande do Sul, Brazil
August 2004

The Cayenne Tern has been treated by some authorities as a separate species but it is now generally regarded as a sub-species of Sandwich Tern. This particular sub-species, S. s. eurygnatha, is found along most of the Atlantic coast of South America from the Caribbean to Patagonia.

It differs from the nominate sub-species in having an all yellow bill.
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