To maximize observation chances in the lower 48 states during winter, where should efforts be focused?

Answer

The region roughly between the Dakotas and Texas, extending west toward the mountains

This area encompasses the vast, flat, and open grasslands that mimic the conditions they seek, offering the highest probability of sighting them in the lower 48 states during the depths of winter.

To maximize observation chances in the lower 48 states during winter, where should efforts be focused?
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