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Pelvis from some sort of columbidae:
https://www.ijcmas.com/6-9-2017/C.%20Lav...
Definitely avian! Hard to narrow down a specie or family group without more pics! Cool find!
It appears to be the pelvis and fused backbone of a bird. It also looks a bit large for a songbird, so perhaps some form of crow or pigeon maybe.