Birdr

Red-billed Tropicbird vs Scopoli's Shearwater

Phaethon aethereus versus Calonectris diomedea

Practice

Play a quiz with Red-billed Tropicbird and Scopoli's Shearwater

Red-billed Tropicbird (Phaethon aethereus) Red-billed Tropicbird
Scopoli's Shearwater (Calonectris diomedea) Scopoli's Shearwater

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These two are often mixed up in quizzes. Look at the photos, then practise the pair until the field marks stick.

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Red-billed Tropicbird · Scopoli's Shearwater · My Tricky Birds