More info: The chestnut backed chickadee is found through the Pacific Northwest forests of the United States and Western Canada, extending from Central California to South-Central Alaska. They inhabit areas along the low elevation of dense, deciduous forests and wet coniferous forests. Chestnut backed chickadees are also frequently seen at backyard feeders in urban, suburban, and rural areas which have plenty of trees and shrubs.
The chestnut backed chickadee starts breeding around mid-March or early April. Generally between 6 to 8 eggs are laid which are white in colour with reddish to light brown spots. Both the male and female incubate the eggs for 12 to 14 days and feed the chicks for 18 to 21 days after hatching.
Time lapse video of a chickadee nest from start to fledge:
Additional Information :
Chestnut-backed Chickadee - birdweb.org
Chestnut-backed Chickadee - Poecile rufescens - ebird.org
Chestnut-backed Chickadee - 70Birds - 70birds.com
Animal Diversity Web - animaldiversity.org