The monotonic surfaces of the Arctic create frequent problems with scale and depth perception, especially on overcast days. Arctic hare and willow ptarmigan sometimes disappear against the snow when they are only two or three yards away. Even when a contrasting animal like a caribou or a brown bear is visible on snow or ice, it is sometimes hard to determine whether it is a large animal at a distance or a small animal at close range. In My Life with the Eskimo Stefansson recalls spending an hour stalking a tundra grizzly that turned out to be a marmot. A Swedish explorer had all but completed
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