What could make a baby bison white?

Photos of a white bison calf in Yellowstone National Park have generated excitement as well as questions: How does that happen?

Calf

Calves ( /ˈkævz/ or /ˈkɑːvz/; singular calf /ˈkæf/ or /ˈkɑːf/) are the young of domestic cattle. Calves are reared to become adult cattle, or are slaughtered for their meat, called veal.

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