garajau-de-bico-amarelo vs rabo-de-palha-de-cauda-vermelha

The Great Crested Tern and the Red-tailed Tropicbird are easily distinguished by their tail and bill features. The Great Crested Tern has a slender, pointed bill and lacks the long, streamer-like tail feathers of the Red-tailed Tropicbird, which has striking red tail streamers and a stout red bill.

Look for the red tail streamers and red bill of the Red-tailed Tropicbird. The Great Crested Tern will have a black cap and a slender, pointed bill.

The Great Crested Tern has a more subdued plumage with a black cap and grey upperparts, while the Red-tailed Tropicbird is mostly white with distinctive red tail streamers.