Many birds fly south in winter to escape the cold and scarcity of food, but Black-capped Chickadees and Tufted Titmice, members of the family Paridae, are year-round residents. In Virginia, after the breeding season ends, chickadees and titmice form loose winter foraging flocks with other species that often include White-breasted Nuthatches, Downy Woodpeckers, and Brown Creepers. The “follower” species travel with the chickadees and titmice because these two “leader” species are excellent food-finders and alert sentinels that help to create a safer feeding environment for the flock.
These parids share a unique call system to communicate with flockmates — a nasal, mechanical chick-a-dee call. According to an article in American Scientist (Sept-Oct 2012), the chick-a-dee call is one of the most complex signaling systems documented in non-human animal species. The calls are used to communicate information on identity and recognition of other flocks, the finding of food, contact with flock members, and predator alarms. Amazingly, subtle variations of the call even communicate information about the size and risk of potential predators. According to Cornell Lab of Ornithology, the more “dee” notes in a chickadee-dee-dee call, the higher the threat level. The call also serves as a rallying call to summon others to mob and harass the predator.
The parids are intelligent, adaptive, resourceful, and curious. They are often the first birds at the feeder in the morning and are entertaining to watch as they interact with other birds. Especially in the drab days of winter, the cheery chickadee-dee-dee call is music to our ears.