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(a) Mean duration (days) and (b) average maximum depth (mm) of snow cover throughout northern latitu
The Dall sheep, Ovis dalli, a mountain sheep of far northern North America, was the subject of one o
Geese are the dominant herbivores in many northern wetlands, such as this marsh at La Perous
California high desert cottontail eating a carrot
Zonal wind speeds on Uranus. Shaded areas show the southern collar and its future northern counterpa
The Northern Lights (Aurora Borealis)