Puffins are the only birds to moult their beaks. In other birds, beaks constantly grow and wear down throughout their lives. Puffins have brightly coloured beaks for the mating season. The outer layer is then shed, leaving them with smaller, dull beaks for the rest of the year.

Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/puffins-are-the-only-birds-to-moult-their/

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Puffins are the only birds to moult their beaks. In other birds, beaks constantly grow and wear down throughout their lives. Puffins have brightly coloured beaks for the mating season. The outer layer is then shed, leaving them with smaller, dull beaks for the rest of the year.

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