In one of those discoveries that's surprising until you think more about it, the fossilized dung of herbivorous dinosaurs was found to contain quite a lot of...shellfish.
Why would plant eaters eat shellfish? While it's possible that they ingested the molluscs by accident, it's actually pretty likely they did it on purpose...
...to help make egg shells. Herbivorous birds do the same thing today to supplement calcium before laying.
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