Chickens, and all birds, have basically hollow bones. The outer shell of the bone is very thin compared to the bones of mammals. I’m not sure what the “bone in vinegar” experiment is, but if its purpose is to see how fast the vinegar acid dissolves the bone I would expect it to dissolve the chicken bone faster. Not because the chicken bone is chemically different, but because the mammal bone is denser.There are also some important differences in how bone cells are arranged between chicken bones and human bones.
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They have different sizes and shapes i wonder