<p>a bison herd, two baby bison nuzzle each other, one is brown and the other is orange</p>
<p>Calves begin to turn brown when they are about two months old. The calf on the left is at least a month older than the calf on the right.</p>
<ul><li>Keywords: bison; buffalo; bison herd; bison calf</li></ul>
NPS Photo
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