A Black-cowled Oriole (Icterus prosthemelas (AKA I.dominicensis prosthemelas)) male sings at El Gavilan lodge, near Puerto Viejo de Sarapiqui (Costa Rica), 6/18/99.
These are Black-cowled Orioles (Icterus prosthemelas (AKA I.dominicensis prosthemelas)). In this example, you'll hear some mimicry, notably of the Olive-backed Euphonia and various Tyrannids.
The mimicry of the Black-cowled Orioles (Icterus prosthemelas (AKA I.dominicensis prosthemelas)) is similar to the mimicry of the Hooded Oriole in North America.