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The picture caption in this article states, “This phytolith, which was extracted from fossilized dinosaur dung unearthed in India, indicates that the reptiles dined on grasses.” I do believe that dinosaurs aren’t classified as reptiles.

Patricia Griffith
American Canyon, Calif.

Confusion in this area stems from the fact that not all ancient reptiles were dinosaurs. But dinosaurs were a class of reptiles, set apart from others by their postures and their hip structures. —S. Perkins