Walker the polar bear (right) met with new male companion Arktos at the Highland Wildlife Park in Kingussie, Scotland. It is hoped that Arktos, and the year younger, slightly smaller Walker will establish a relationship of friendly competitiveness.
Horsetail Fall in Yosemite National Park in California is pictured from a position along the Merced River off Southside Drive in Yosemite Valley just before sunset as it glows on February (REUTERS/Phil Hawkins)
A lenticular cloud formed as high winds blew over the rugged Crazy Mountains in Montana. Lenticular clouds are stationary lens-shaped clouds that form at high altitudes. (James Woodcock, Billings Gazette via Associated Press)