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I found two of these objects near a creek in Missouri. They feel like they are made out of bone but they do not look like any bone I have seen before. They also appear as though the could be some sort of plant part. I am having a very difficult time identifying them and any help would be appreciated. enter image description here

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Those are isolated turtle bones:

turtle bones

Specifically, they are part of the carapace, or upper shell. The projections would articulate with the backbone. The "toothlike" structure at the other end projects down toward the margin of the shell.

Based on the size, and the fact that you are in Missouri, I'm guessing they are snapping turtle bones. Here's a photo of the inside of a snapping turtle shell:

Snapping turtle

They are a little hard to make out, but you can faintly see the marginal projections.

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    $\begingroup$ Wish 10 upvotes were allowed. The third photo on this page cleared up one of my befuddlements. $\endgroup$ – anongoodnurse Apr 30 '18 at 16:34

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