Birdr

Grey-backed Tern vs Great Crested Tern

Onychoprion lunatus versus Thalasseus bergii

Practice

Play a quiz with Grey-backed Tern and Great Crested Tern

Grey-backed Tern (Onychoprion lunatus) Grey-backed Tern
Great Crested Tern (Thalasseus bergii) Great Crested 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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Grey-backed Tern · Great Crested Tern · My Tricky Birds