Some birds that fly south into the U.S. during the winter migrate ... as an irruption. The boreal forest stretches across the ...

Common and hoary redpolls are 2 closely related finches of the boreal forest ... and much of Alaska. The rostrata breeds in tundra scrub, where it overlaps with the hoary. Winter: forms large ...

Canada’s immense boreal ... Alaska to Newfoundland and Labrador, their numbers have dropped significantly over the years. Across the country, caribou are threatened by the break up of intact ...