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Shipworms Clams Are Known To Consume Wood. But This Newly Discovered, In The Philippine, Shipworms Clam, Known As Lithoredo Abatanica, Is Said To Consume Rock, Specifically, Limestone. Scientists Are Still Baffled As To The Benefit(s) Of Rock To The Animal. Few Animals Like Birds Eat Rocks To Help With Digestion.

This Weird Animal Eats Rocks for Breakfast

https://www.livescience.com/65739-newly-discovered-clam-eats-rocks.html

This is the only known animal that eats rock by burrowing.