Weird and creepy

I had to go to the post office yesterday to mail off a birthday present. I didn't have any plans to go thrifting but I was close to  a favorite Goodwill store so I popped in. There wasn't much there as usual so as I was leaving I noticed this very weird and scary face. I had no plans to buy it but just wanted to see what the face was made of. As I turned it over thinking the base was made of wood I realized it was a giant vertebra and the face must be bone. That had to be one big animal! It will be interesting to see how much I can sell it for! Any guess what I'll get for it?