Quote History Quoted:Are you asking why they don't stick around for another clutch? Eastern bluebirds are year round residents in southern WI and only present in northern WI during the breeding season. Not knowing where you are in WI, this could be why you're only seeing one clutch. Make sure there aren't sparrows in the area as they are in competition with bluebirds for nesting sites. If you have regular bird feeders, you may be unintentionally inviting sparrows to the area. Also, you mentioned that wrens arrive after the bluebirds, this may also be a contributing problem. There are 4 species of wrens that are in Wisconsin for the breeding season only. If you add wren boxes you are actually encouraging them to locate near you which may hasten the bluebirds leaving. Wrens will successfully enter a bluebird house and eat/destroy bluebird eggs as well as other species(
House Wren see nesting). It's what they do, and they are very successful at it. They are the house burglar of the bird world..lol.
There is a wealth of knowledge here....
Cornell Ornithology if you enjoy this stuff.
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I'm in Sheboygan Co.
and yes, I'm asking why they don't stick around for a 2nd clutch.
I don't feed the birds, I have no sparrows around me.
I don't have wren boxes up now, so they are using the bluebird boxes. Thats why my thought of putting up wren houses, so the wrens stay in the woods edge and don't bother the bluebirds.
There are some older bluebird boxes on the edges of the field on trees that bluebirds won't use and the wrens seem to avoid them too. I get more mice than anything else in them.
I have 1/2 dozen boxes in a 3 acre field that surrounds the house.
The field is all prairie grasses and forbs except for a very small lawn around the house.
The house doesn't bother the bluebirds, they regularly sit on the gutters watching for prey.
Are the grasses/forbs maybe too tall to be of interest to bluebirds? When they get here in the spring the grasses/forbs are very short, maybe 1-2ft at most.
Mid July maybe 3-4 ft tall, right now the grasses are easily 6ft and some maybe 8ft or more.