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Not only that, but eating clay—a phenomenon called geophagy—provides the birds with needed salt, along with balancing their pH.

Eating large amounts of dirt is called soil pica, or geophagy.

Eating earth, which scientists call "geophagy", is a known habit among chimpanzees as well as other animals.

Eating clay, also known as geophagy can occur in both animals and humans.

Eating soil or its component parts is known as geophagy.