What is "swallow tanager"

n. ''Tersina viridis'', a tanager found widely throughout South America.

Tersina is a genus of tanager. It contains a single species, the swallow tanager (Tersina viridis) . It is found widely throughout South America, from Panama to n. Argentina.

The species is somewhat dimorphic, as the female is a yellow-green, and the male a brighter light emerald-green, with a small deep black face and upper throat patch.