When we compare eastern bluebird occupancy at the study site with that of the house wren
, another secondary cavity nesting species, we find that while bluebirds were declining, house wren
numbers did not appear to change much over the ~ 20 y at this study site.
72) house wren
nests than for nonsuccessful ([bar]x = 9.
1996), other nest associates found in House Wren
nests included fleas (Siphonaptera), psocids (Psocoptera), jumping spiders (Salticidae), and ants (Hymenoptera), Psocids appeared in most nests in low numbers, but were not counted.
The incubation period was 15-16 d for the House Wren
eggs and 16-17 d for the Tree Swallow eggs; host clutch completion date was used to define the start of incubation for the House Wren
eggs since no other adults were observed attending the nest.
The 77% predation rate on House Wren
nests in boxes at Eagle Creek Park was the highest yet reported for this species.
Dykstra and Karasov (1993b) calculated that an adult House Wren
would need to collect 38.
If you find a box filled with little sticks, you know house wrens
used it last season.
To examine the combined effects of trade-offs for future fecundity and offspring survivorship on fitness and to compare life history strategies, I constructed a simple model of House Wren
population dynamics (Nur 1984, Caswell 1989).
His service project, completed for Silver Falls State Park, involved creating birdhouses and nesting boxes for mountain chickadees and house wrens
The birds I observe frequently include American robins, house sparrows, house finches, tree swallows, American goldfinches, mourning doves, and house wrens
and chickadees use the bird houses set back in the pines.
from bushes and trees, and if house wrens
take over the boxes, move them farther away from trees and shrubs.
Every year, tree swallows and house wrens
take over almost two-thirds of the 400 bluebird houses in Fort Lewis, Washington.
and blue jays dipped but rebounded by 2005.
Chickadees, titmice and house wrens
not only nest in these open spaces but also along woodland edges and deeper into open woods.