Birdr

California Gull vs Cassin's Vireo

Larus californicus versus Vireo cassinii

Practice

Play a quiz with California Gull and Cassin's Vireo

California Gull (Larus californicus) California Gull
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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California Gull · Cassin's Vireo · My Tricky Birds