We found this bone on the beach today in Guernsey. It looks like a bird's beak. Its about 10cm long so quite big.
Any idea which bird it can be?
I'm almost certain that is not a bird bone, but is instead the lower jaw of a fish turned upside down. The groove along what is the upper edge in your photo is part of the lateral line system; the jaw joint is the bit in the upper left corner. It's not a very diagnostic bone, so I couldn't tell you exactly which fish it is, but it is a fish.
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