When do Chestnut-backed Chickadees nest and feed only in the lower half of trees?
They do this to minimize competition when part of their range overlaps with that of the Black- capped Chickadee. This bird is a cavity nester. One blanket of fur lines the nest, another is made to cover the eggs when parents leave the nest. Chestnut-backed Chickadees cache food in the fall to consume in winter.
Groups of chickadees are collectively known as a “banditry” or “dissimulation.”