Enter into the ultra-adventurous world of pilot-biologists chasing wild birds in the no-man's-land north of the arctic circle. Their world is one of beauty and grit, humor, science, and the tundra swans they study are magnificent creatures, traveling to both sides of the straight of Beringia, the thin stretch of water that separates Alaska from Russia. This east-west connection is what endangers the birds, and potentially humans that interact with them.—Anonymous