Birdr

Chestnut-sided Warbler vs Black-throated Blue Warbler

Setophaga pensylvanica versus Setophaga caerulescens

Practice

Play a quiz with Chestnut-sided Warbler and Black-throated Blue Warbler

Chestnut-sided Warbler (Setophaga pensylvanica) Chestnut-sided Warbler
Black-throated Blue Warbler (Setophaga caerulescens) Black-throated Blue Warbler

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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Chestnut-sided Warbler · Black-throated Blue Warbler · My Tricky Birds