Birdr

Forster's Tern vs Cassin's Vireo

Sterna forsteri versus Vireo cassinii

Practice

Play a quiz with Forster's Tern and Cassin's Vireo

Forster's Tern (Sterna forsteri) Forster's Tern
Cassin's Vireo (Vireo cassinii) Cassin's Vireo

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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Forster's Tern · Cassin's Vireo · My Tricky Birds