Sacrum

... a strange bone while I was walking at the C&O Canal. I've searched my memory, friends, and the internet and have considered that it might be a sacrum but nothing quite fits. My boyfriend thinks it might even be a bird skull, but it would be a huge bird and the eye sockets seem too small- plus ...

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i thought sort a sacrum looking too. But what kind? that is the question?

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.. 8) as I said...my professor also said that it was os koxa, combination of os sacrum and os coccyx. For the explanation, just see the hole at both side. My professor said that it wasn't a skull because if it's a skull, then those holes will be located at the back ...

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Another concept...how bout this: I can tell that it's a combination of os sacrum and os cocxygea forming os koxa with the asetabulum at both side (see two little round holes at each side). So, If Joker said that the length of this bone is 6 inches (sacrum + coccyx) ...

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