Nest box update
To review: Chestnut-backed Chickadees laid 7 eggs 3/28 and 3/29. 4 hatched 4/13 Photos posted previously. Since then (Measurements taken from TV image, ratio calculated to get true length):
4/13 At hatching chicks ~ .75" long
4/17 1.7" Fuzzy tufts appear on head. Dark lines on back and wings appear, probably feather tracts. A row of dots appears on wings.
4/18 1.9" Row of dots on wings is now a row of ridges.
4/19 2.1" Dark areas expanding, feathers developing on wings.
4/20 Chicks are getting too big and fat to measure. More fuzz on bodies, feathers on wings longer.
See photos: http://www.flickr.com/photos/49266924@N04/