The blue-gray tanager (Thraupis episcopus) is one of about 230 species of tropical and subtropical tanagers, and one of the most common and unmistakable birds in Costa Rica. It is a generalist frugavore (fruit-eater), found in a great variety of different habitats, most often in pairs.
It is plentiful and highly visible at Selva Verde, where it regularly frequents bird-feeding trays. Its primary diet comprises succulent fruit from trees, shrubs and vines. Recent studies confirm it has remarkable discriminatory capabilities and can detect 0.09 percent protein variations in food.
These tanagers are restless, always on the move. Their call is a raspy squeaky twittering. In flight, they are easy to distinguish because they seem to bounce through the air, alternatively flapping their wings, then gliding with the wings tucked close to the body.