My daughter found this bone on the beach. I don't know if it's from a fish or bird or what. It's about 6 inches / 15 cm long.


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Wow, that's an odd one. However my guess is that it's a fish of some description as they have a number of these super thin and smooth bones. Fish have really complex head swith tons of small and odd shaped bones and I think this is most likely some part of the skull, but it could be the base of one of the fins.

Dave is right about it being from the base of one of the fins - it's a hyperossified pterygiophore. I'm afraid I don't know which species it's from though.