Characterization: This bird has a large, black beak. The male is completely dark blue with bright blue parts. The female and its chicks are completely brown, with a under portions that are a little lighter in color. This species has a sonorous, melodious song, which is different at dusk and at dawn.

Distribution: From Northeastern Brazil to Rio Grande do Sul, Bolivia, Paraguay, and Argentina.

Habitat: It is found on the edge of swamps, secondary forests, and crops.

Habits: This bird is very territorial. It is not seen in flocks. If there is a couple at a given location, you will only find another one a distance away. Ultramarine grosbeak chicks stay with their parents for some time and, later, leave for to live independently, as the ultramarine grosbeak's territorial instinct will not let them get close after reaching adulthood.

Diet: Its eating habits are quite varied, especially seeds, fruits, and insects.

Breeding: The ultramarine grosbeak breeds between September and February, builds its nest not far from the ground, and each brood usually has 2 to 3 eggs, and there are 3-4 broods per season. The hatchlings are born 13 to 15 days after the eggs are laid.

In the UFRA area: This species is considered rare at the studied farms, as it was reported only eight times. Sightings were restricted to organic sugarcane fields, among other habitats.