TONY CAMACHO / SCIENCE PHOTO LIBRARY TONY CAMACHO / SCIENCE PHOTO LIBRARY
Flock or herd of southern ostriches (Struthio camelus australis) performing geophagia in the Kgalagadi transfrontier park in Southern Africa. Ostriches practice geophagia, picking up stones and pebbles from the ground, swallowing them and often keeping them in their gizzards, in order to help grind up and aid the digestion of food.
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