June Without a doubt this is the most exhilarating time of the sub-arctic year. Warming temperatures and 24-hour daylight quickly melt winter snow. From early June the park is alive with the activities of breeding birds, newborn lambs, moose and caribou calves, and grizzly cubs. Mountain slopes and meadows are studded with wildflowers. July During summer's warm days, we find caribou nursery bands in high alpine meadows. Moose are often seen feeding on aquatic vegetation in tundra ponds. Fledgling waterfowl and young Golden Eagles add interest to the days' observations. By late July the summer-green tundra grows rich with blueberries, embellishing the grizzly's diet. August and Early September Shorter days and cooler temperatures transform the tundra into a brilliant tapestry in late August. "Termination dust," the first snow of oncoming winter, often blankets surrounding hills. Moose and caribou complete their yearly antler growth. Stars are visible for the first time since April, and the aurora borealis may be seen on clear nights.