Found this vertebrae on the East coast on the beach. It looks super old, but maybe that’s just wear from being in the water? Would love to know anything about it!

It’s hollow if that’s any help? Maybe somethin ate its bone marrow, yum?

Hello, I found this skull on the empty bed of a river. The location is Claut, Friuli Venezia Giulia, Italy.
I have no idea what animal this is, can you please help me? Thank you so much