Look at these little rocks I've found in this fossil field. Each one is round, and some have a hole through the middle.

They look like beads of a necklace, don't they? Do you see how each bead is shaped differently than the others? It may look like something a human made, but I think they're actually fossils. But from what animal?

Let's look at several other fossils found here—maybe we can match these necklace beads with a complete fossil of the same animal. Which of the critters below might the beads come from?

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