I always learn something new about the wildlife around us, every time I seek out information about them. Consider, for example, this bit of information about flocks of Dark-Eyed Juncos I found at 'birdinginformation.com' - http://www.birdinginformation.com/birds/sparrows-towhees-juncos/dark-eyed-junco/)

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"When flocks of Dark-Eyed Juncos join together for the winter, they use their social rank for protection. Studies show that the dominate birds stay in the center of the flock (about10-30 birds) where they are protected from predators. First are the oldest males, surrounded by the young males, the oldest females, and finally the young females! They keep their place in the flock by using displays of dominance which includes aggressive lunges, and by flashing their white tail feathers."

That's ice on its tail! (There's a bit of noise in the background. Small sensors can be a bit noisy. Here I find it appealing.)