A Ruby-crowned Kinglet (Regulus calendula), a less gregarious winter migrant to the hill. They are often found in mixed-species flocks but are outnumbered, at least 10-1, by Golden-crowned Kinglets. (Image: Brendan McGarry)

Everywhere I looked there were birds. Sprites in perpetual motion, determined to find their next meal. Kinglets, chickadees, creepers, nuthatches, and wrens worked through the forest understory as I sat watching. It hardly felt like they noticed me. If I kept still enough, I’d just melt into the background, or at least that’s how it feels when you encounter a winter feeding flock.

Back in October I started noticing mixed-species flocks of chickadees, Golden-crowned Kinglets, and a few Pacific Wrens around my yard. This is my personal cue for the changing of the seasons. When the last of the year’s fledglings are self-sufficient, the winter migrants have arrived, and breeding territories are moot, it’s officially winter. The majority of birds are now much more concerned with surviving the cold, less abundant months, than defending their corners of the forest or your backyard.

Call them mixed-species foraging flocks or winter feeding flocks, every year these groups of birds form during the non-breeding season on Capitol Hill and across our region. They move together, across the landscape, foraging as they go, all day long.

The birds that make up these flocks in our part of the world have a fair amount in common. They are all small, active birds that eat a lot of insects (but also seeds and fruit). Most of them glean their meals from tree bark crevices and the undersides of leaves. Some are faster moving and more balletic, like kinglets, twirling about foliage and eating unseen tiny morsels. And others feel more methodical, like Brown Creepers, who do as they are named and crawl up and down tree trunks in search of sustenance. But they all seem to see the value of keeping close together while foraging this time of year. Continue reading →