mergulhão-de-penachos vs mergulhão-de-faces-brancas

The Slavonian Grebe and Red-necked Grebe can be distinguished by size and plumage. The Red-necked Grebe is larger with a robust bill, while the Slavonian Grebe is smaller and more compact. During breeding season, the Slavonian Grebe displays chestnut on its neck, breast, and flanks, whereas the Red-necked Grebe has a more uniformly red neck.

Look for the larger size and robust bill of the Red-necked Grebe. During breeding season, note the Slavonian Grebe's chestnut plumage on the neck and flanks compared to the Red-necked Grebe's uniformly red neck. Observe behavior; the Red-necked Grebe is more aggressive and vocal.

The Red-necked Grebe is larger than the Slavonian Grebe.

In breeding plumage, the Slavonian Grebe has chestnut on the neck, breast, and flanks, while the Red-necked Grebe has a uniformly red neck.

The Red-necked Grebe is highly pugnacious and territorial, often engaging in aggressive behavior towards other waterbirds. The Slavonian Grebe is known for its intricate courtship displays.

Both species breed on northern lakes, but the Red-necked Grebe is more likely to be found in larger bodies of water and is more circumpolar in distribution.

The Red-necked Grebe is known for its frequent raucous calls during the breeding season, while the Slavonian Grebe is not noted for such vocal behavior.