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House Sparrows build a tall nest of coarse grasses, often with pieces of scrap paper, cellophane, feathers,
or other litter. The nest forms a canopy over the nest's cup which has a tunnel-like entrance.
House Sparrows take over the nesting sites of other native cavity-nesting birds.
It is prolific and ruthless.
It will destroy Bluebird eggs, incubating adults, and nestlings,
sometimes building its own nest right on top of the bodies of its victims.
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