Those dinosaurs on the nests were probably adult males who wouldn't have needed calcium for making eggshells.
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Related: calcium
Prev: Soy products like tofu, tempeh and fortified soymilk do double duty in this regard, since they provide both calcium and protein.
Next: For example, G10 garnets, a type of garnet typically found in diamond-rich pipes, are lower in calcium and higher in chrome than garnets from barren pipes.