Winter can leave Coloradans feeling dull and somber. The sound of songbirds fades away, the green turns to gray, and wildlife viewing is sparse. As soon as spring approaches, baby animals start to appear in tree nests and burrows, the sound of birds finds its way back through our windows, greenery emerges, and chattering squirrels frolic. For Greenwood, this is one of the busiest times of the year. A litter of baby squirrels, tiny and eyes closed, wander through the leaves of their mother’s nest. We call them…