Birdr

Sandwich Tern vs Black-throated Diver

Thalasseus sandvicensis versus Gavia arctica

Practice

Play a quiz with Sandwich Tern and Black-throated Diver

Sandwich Tern (Thalasseus sandvicensis) Sandwich Tern
Black-throated Diver (Gavia arctica) Black-throated Diver

Media

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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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Sandwich Tern · Black-throated Diver · My Tricky Birds