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June 1, 2010
Bluebird Trail - 6/1/10
Box 1 - House wrens - 0 eggs (I'm reasonably certain at this point that this is a decoy nest.)
Box 2 - House wrens - 0 eggs (I'm reasonably certain at this point that this is a decoy nest.)
Box 3 - Mountain Bluebirds - 5 blue eggs. Mom on nest. I'd say she officially began incubation of 5 eggs on 5/30/2010. Assuming an incubation period of 13-15 days, her eggs should hatch on June 12-14. This morning, she wasn't on the eggs, but she was watching them. I think that "incubating eggs" allows for some time off of the nest in nice weather.
Box 4 - House wrens - 0 eggs. This nest has straw in the nest of twigs, indicating that the nest was completed, but no eggs were ever laid. I believe this nest has been abandoned.
Box 5 - Mountain Chickadees - 7 white eggs. (Same yesterday.) Mom has begun incubating the eggs as of today. She hissed at me like crazy. First I've seen of her. She officially began incubation of 7 eggs on 6/1/2010. Assuming an incubation period of 12-14 days, her eggs should hatch on June 13-15.
Box 6 - House wrens - 3 pink eggs. No change from yesterday. I'm not clear why the mom is not incubating yet. I believe this nest has been abandoned.
Box 562 - Mountain Chickadees - 7 white eggs. Mom on nest. She officially began incubation of 7 eggs on 5/30/2010. Assuming an incubation period of 12-14 days, her eggs should hatch on June 11-13.
Box 7 - Tree swallows - no nest yet.
Box 8 - Western Bluebirds - 6 blue eggs. Same as yesterday. Mom still not incubating.
Mountain Bluebird eggs: 5
Western Bluebird eggs: 6
House Wren eggs: 3
Mountain Chickadee eggs: 14
Total eggs: 28
I'd wager money that, at this point (June 1), all eggs have been laid. I'd say nest construction begins mid-May, and eggs are laid by the end of May. Birds should hatch by mid June, and fledge at the end of June, I think.
Posted by Rob Kiser on June 1, 2010 at 10:15 AM
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