olho-dourado-comum vs triste-pia

The Common Goldeneye and Bobolink are easily distinguished by their habitats and behaviors. The Common Goldeneye is a diving duck often found in water, while the Bobolink is a songbird seen in grasslands. Their plumage and structure are also markedly different.

Habitat is the most reliable field mark: look for Common Goldeneyes in water and Bobolinks in fields. Size and structure are also key: the Goldeneye is a larger duck, while the Bobolink is a small songbird. Plumage differences are stark, especially in breeding males.

The Common Goldeneye is a medium-sized duck, much larger than the small songbird Bobolink.

Common Goldeneye males have a distinctive white patch on their face and glossy greenish-black heads, whereas Bobolinks have a unique breeding plumage with a black face and a pale nape. Females and nonbreeding males of both species differ significantly, with the Goldeneye showing more muted, duck-like patterns compared to the streaked, sparrow-like appearance of the Bobolink.

Common Goldeneyes are diving ducks, often seen diving for food in water. In contrast, Bobolinks are ground foragers, often seen in grasslands or flying in flocks.

Common Goldeneyes are typically found in lakes, rivers, and coastal waters, while Bobolinks prefer open grasslands and fields.

The vocalizations of these species are distinct; the Common Goldeneye makes a whistling sound with its wings, while the Bobolink is known for its bubbly, melodic song.