Birdr

Aleutian Tern vs Black-naped Tern

Onychoprion aleuticus versus Sterna sumatrana

Practice

Play a quiz with Aleutian Tern and Black-naped Tern

Aleutian Tern (Onychoprion aleuticus) Aleutian Tern
Black-naped Tern (Sterna sumatrana) Black-naped Tern

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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Aleutian Tern · Black-naped Tern · My Tricky Birds