For months of the Arctic summer, reindeer can live under almost continuous daylight. Then winter arrives and their visual world shifts toward prolonged darkness and extended blue twilight. Remarkably, reindeer …
Across an Arctic winter landscape, snow can dominate almost everything the human eye sees. Hills, frozen ground, and wind-shaped drifts merge into a bright environment where objects may appear to …
A polar bear moving across Arctic sea ice can appear to be searching an empty landscape. The surface may stretch for miles with little more than snow, pressure ridges, cracks, …
Across an open Arctic landscape, a group of musk oxen notices wolves approaching in the distance. The herd becomes more compact. Large adults turn toward the threat, while younger and …
Summer on the Arctic tundra can bring a dramatic burst of biological activity. Migratory birds arrive to breed, eggs fill nests, insects emerge, and in some regions populations of lemmings …