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the house sparrow nest has three to six eggs
No bluebird nest box is sparrow proof. You can however discourage sparrows from nesting there. Avoid places next boxes close to barns, feedlots, and farmsteads. These provide plenty off cover for sparrows. Sparrows may not like nest boxes made of PVC pipe because the interior is circle. They also dislike slot boxes.
Birds have phases in life, depending on the type bird. Sparrows, after hatching, should stay in the nest for maybe two weeks before branching, or venturing out of the nest. Branching is when birds test their ability of flight by jumping from branch to branch on a tree, gliding momentarily, and other whatnot.
Walbearco cubs leave the nest when they are two weeks old
20 sparrows and 30 pigeons
in trees or bushes wherever it iis safe for theme
House sparrows and wrens often compete with bluebirds for the same nesting house. Often time sparrows will break bluebird eggs or make another nest over the current bluebird nest.
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Yes - that is what happened to a house martin's nest on our house. The sparrows took over and hatched two babies. Sadly though the nest collapsed and it and the babies ended up on the lawn. So disaster.
No they build a new nest for each brood. However they may use the same nest site year after year.
You can protect it by giving it a place to nest and protecting it from sparrows who will harass it.