America's Wild Border: Northern Exposure

America's northern border with Canada shows a wide range of habitats and weather extremes; even in the absence of a physical border, the political boundary poses many problems for wild residents. America's northern border with Canada shows a wide range of habitats and weather extremes; even in the absence of a physical border, the political boundary poses many problems for wild residents. America's northern border with Canada shows a wide range of habitats and weather extremes; even in the absence of a physical border, the political boundary poses many problems for wild residents. America's northern border with Canada shows a wide range of habitats and weather extremes; even in the absence of a physical border, the political boundary poses many problems for wild residents.