The “snowbirds” have returned.  If you live near an open field or keep a bird feeder stocked, chances are a fluttering entourage of dark-eyed juncos has already checked in. These dapper little sparrows spent the summer deep in Canada’s boreal forests, busily raising families and feasting on insects. Now that winter is tightening its grip, they’ve headed south in search of more forgiving weather and easy meals.  Take a closer look at your flock and you may notice something curious: it’s often a boys’ club. Male juncos wear a sharp, tuxedo-like outfit of dark gray and white, while females sport a softer, lighter gray look. The reason for the imbalance? Females tend to migrate farther south, while many males stick it out closer to Canada. Some bold young males even gamble on wintering right along the border.  Why brave the cold? It’s all about real estate. When spring arrives, males that return first get the best breeding territories. Older, dominant males usually win these prime spots, but younger males are willing to endure harsher winters on the chance that a few of their elders won’t make it back. Harsh? Yes. Strategic? Also yes. Watch your feeder carefully. The dominant males may rule the roost, but when a hawk swoops through and chaos erupts, it’s often the lower-ranking males who dart back first, grabbing a quick snack while the big shots are still looking over their shoulders. Winter survival, junco-style, is equal parts grit, timing, and a well-earned snack.