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04/16/2014 10:36 AM EDT

Here they come… welcome the first bison calves of 2014 to the National Bison Range Refuge in Montana! Weighing in at 40-50 pounds, these wee ones will stay red for a few months before turning brown. By the time we see them at the annual roundup in October, most will weigh between 250-350 pounds.

Photo: USFWS