From Flocking to Fighting

One of the joys of spring is watching and listening for the return of migrating birds. Those first calls of the phoebe, the robin, the wood thrush, or the indigo bunting are sure to bring wide smiles to our faces and an excited, “Did you hear that!?” All’s right with our little vernal world when we know that our winged travelers have come back for the season.

But there’s another fascinating spring event that I like to observe: the year-round resident birds, as they morph from close-knit feeding buddies in a flock, to sparring rivals, who enter into courting rituals.

Throughout the winter we have chickadees, titmice, and goldfinches flocking at the feeder—maybe a dozen or more of each species. To my untrained eye years ago, they all seemed to be close-knit friends, but that was a bit of anthropomorphizing on my part. Birds rarely are friendly with one another—tolerant is a better word for it (at best). In fact, they most always aggressively establish a pecking order that determines who dominates. At the feeder, sweet little chickadees are the most submissive and intimidated. Titmice pick on them, while they in turn are subservient to finches and nuthatches. Small woodpeckers come next, topped off by the cardinals.

But there’s also a harder-to-distinguish pecking order that gets established within each species. It’s more difficult to follow, because I’m as yet unable to tell one titmouse from another. Thus I can detect a hierarchy process going on, but do not know which bird is boss, or if he stays boss for long.

Despite the pecking order dynamics, however, during the winter the birds flock together in a decently non-combative manner around the feeder. Come spring, though, inner mating urges begin to control their behavior. It’s combat time. Winter’s proximity gives way to spring’s territorial jousting. The birds begin to call incessantly, in order to establish their mating and breeding turf. It’s fun to watch their antics, as they begin to challenge each other for the nicest patch of ground. They dive, feint, chase, squabble, show off, sing vociferously, and just as quickly stop and perch next to one another, as if a truce was suddenly called.

I’ve read that the dominant male of each species (the one in command at the winter feeder) gets the first pick of breeding territory. Around here that means the clearing, as it’ll have the highest population of insects during the summer. Maybe someday I’ll learn how to trap and band birds, so I can identify individuals. Then I can verify if Dominant Tom Titmouse at the feeder is the same guy whose mate now reigns in the nesting box in the back yard, or if Submissive Sam managed to outwit Tom or sing better than he did, and get the prime location.