アメリカ自然史博物館のインスタグラム(amnh) - 11月19日 08時30分

Puffins have been dubbed "clowns of the sea" because of their facial markings and brightly colored bills—but this humorous appearance doesn't last throughout the year! The Atlantic Puffin (Fratercula arctica) develops its orange bill, with a yellow-outlined patch of blue, during spring’s breeding season. Beak size increases as the bird matures, so size and color may be a way for puffins to assess their potential mates. In winter, both males and females lose their parrot-like look, leaving behind a shorter, dark bill.
Photo: Richard Bartz

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