Sandwich, Kent, England.
Genetic data suggest may be sister to T. elegans#R. Previously also linked with T. bengalensis and T. bernsteini. Recent genetic study#R suggests race acuflavidus may be closer to T. elegans than to nominate sandvicensis; juveniles of the two are highly divergent, birds becoming increasingly alike with age. Form eurygnathus (“Cayenne Tern”; often misspelt eurygnatha#R) previously considered a separate species, but S Caribbean data indicate it is a race or perhaps morph of T. sandvicensis, and that all New World populations (except those of extreme N) have at least small percentage of “Cayenne”-type birds; based on recent genetic study#R, eurygnathus here treated as a synonym of acuflavidus; the two interbreed freely in S Caribbean, and mixed pairs occur in Patagonia and Puerto Rico; in Curaçao typical acuflavidus make up 20% of population, while in French Guiana they comprise less than 1%. Two subspecies recognized.
Food and feeding
Status and conservation
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