Motmot

Red-billed Tropicbird vs Black-throated Diver

Phaethon aethereus versus Gavia arctica

Practice

Play a quiz with Red-billed Tropicbird and Black-throated Diver

Red-billed Tropicbird (Phaethon aethereus) Red-billed Tropicbird
Black-throated Diver (Gavia arctica) Black-throated Diver

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Writing a comparison…

This looks up Birds of the World identification notes, then asks the model to contrast the pair. It can take a minute.

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Red-billed Tropicbird · Black-throated Diver · My Tricky Birds