The High Life | The Alps

When the ice on high alpine lakes begins to break, brown frogs appear with a mission. In the hundreds, brown frogs rush to the water, as none want to miss their annual springtime mating ritual.

Eight out of ten eagle kills are marmots, mostly youngsters. To protect her young, mother marmots are always on the lookout for deadly eagles.

Go behind the scenes of NATURE's two-part miniseries "The Alps." The filmmakers braved frigid climates and tough terrain to capture the intimate moments of the animals living in the Alps.