negrola-americana vs pernilongo-de-costas-negras/de-costas-brancas

The Black Scoter is a sea duck with dark brown plumage and a distinctive dark cap and light cheeks, while the Black-necked Stilt is a wader with long legs and a striking black-and-white pattern. These species differ greatly in habitat and behavior, making them unlikely to be confused in the field.

Check habitat first: Black Scoters are in coastal waters, Black-necked Stilts in wetlands. Look at leg length: Stilts have long, slender legs. Plumage pattern: Scoters are uniformly dark with light cheeks, while Stilts are black-and-white.

The Black Scoter is a medium-sized duck, whereas the Black-necked Stilt is a tall wader with long, slender legs.

The Black Scoter has dark brown plumage with a dark cap and light cheeks. In contrast, the Black-necked Stilt features a bold black-and-white pattern, with a black back and white underparts.

Black Scoters are found in shallow coastal waters, often in large flocks, while Black-necked Stilts inhabit wetlands with emergent vegetation.

Black Scoters are known for the constant mellow, plaintive whistling sound of the males, whereas no specific vocalization details are provided for the Black-necked Stilt.