rabo-de-palha-de-bico-laranja vs pardela-escura

The White-tailed Tropicbird is easily distinguished from the Sooty Shearwater by its striking white plumage and long, slender tail streamers. In contrast, the Sooty Shearwater has a uniformly dark, sooty appearance and lacks the long tail streamers.

White-tailed Tropicbird: Look for the bright white body and long tail streamers. Sooty Shearwater: Note the uniform dark, sooty plumage and lack of tail streamers.

White-tailed Tropicbird is predominantly white with black markings on the wings and a long, white tail with streamers. Sooty Shearwater is uniformly dark, with a sooty brown coloration.