|Photo shows relative size of some speckled cavity nester eggs, with the Black-capped Chickadee being the smallest. Photo by Bet Zimmerman.
|Left to right: Bluebird, House Sparrow, Tufted Titmouse, House Wren, Black-capped Chickadee eggs relative to a dime. Photo by Bet Zimmerman.
|Two Tufted Titmouse eggs compared to a Black-capped Chickadee egg. Nest and eggs are hard to tell apart initiallyl, although Tufted Titmouse nests tend to be bulkier and have dried leaves. Photo by Bet Zimmerman.
|Black-capped Chickadee egg relative to House Wren egg. Chickadee eggs have little gloss, House Wren eggs tend to be glossier. Photo by Bet Zimmerman.
|Egg size comparison, including Robin egg. Photo by Bet Zimmerman.
– John Burroughs, The Bluebird