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They haven’t got that far to go in terms of total distance, but these girls are heavily pregnant – you can see it. Imagine if you were, say, eight months pregnant and you had to walk, sometimes run, over wet, muddy ground and slushy snow for about 150 miles. No wonder they’re slowing down. And the weather’s continuing to warm up. It’s an uncomfortable time for animals used to surviving extreme cold - they seek out patches of snow to help keep them cool.