This bird is often confused with Great Kiskadee (Pitangus sulphuratus) but has an oversized black bill (like a 'swollen nose') with a distinctly decurved culmen. Also there is a definite olive tinge to the back and no rufous on the wings. The other clinching fieldmark separator is the white supercilium which does not meet on the nape like Great K. It is noisy with irritating and unpleasant (to human ears) vocalizations. Most frequent call is a nasal, grating, and mocking nya, nya, nya, nya as it bobs its head. In disputes it has an even louder more insistent squealing. f/7.1, exp comp minus one and two-thirds, iso 1600, 1/50.