The Red-winged Blackbird is the most common on the plains of Guanacaste and Alajuela, to the northern part of Costa Rica; it is also found on the Caribbean lowlands, in Rio Frio. Their song is unmistakable and has a metallic quality. Males display a red-orange patch on the shoulder, which contrasts nicely with an otherwise black body. They perch on grass in open plains and even on electricity wires to deliver their song.
The Melodious Blackbird is not very distinctive, with an entirely black body, bill and eyes. Although the plumage is black, it can look blueish under the morning light in the rain forest. I have probably seen this species a bunch of times, but wasn’t aware of it, as it can be confused with the Great-tailed Grackle and the Groove-billed Ani. It is pretty common around the country, and can be found on almost any habitat. It is relatively big when compared with tanager species that are found in the same habitats as this bird.