In an effort to be top bird of their territory, house wrens will fill bird houses with fake nests to discourage other birds from nesting them. I checked my blue bird house, in which a nice pair of bluebirds had begun to build a nest, only to find it filled to the top with sticks (see above: the bluebird nest was on the bottom of the bird house, which I pulled out of the removable bottom). The little bastard topped their nest with sticks (the mess inside the bird house) and it worked - I haven't seen the bluebirds for weeks, inside the bird house anyway. I saw Mrs. Bluebird taking a bath in the bird bath this evening, so at least they're nearby.
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