The green-headed tanager (Tangara seledon) is native to southeastern Brazil, southeastern Paraguay and northeastern Argentina. It feeds on fruit and insects.

The violet-capped woodnymph (Thalurania glaucopis) is a species of hummingbird found in Argentina, Brazil, Paraguay and possibly Uruguay. It is a short-distance migrant. It feeds on both nectar and small insects.

This stamp set was issued in 2011.