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Mockingbirds can be quite territorial, attacking hawks, dogs, cats and even humans. I suppose if the mockingbird saw the baby bluebirds as a threat to its territory it could attack or kill baby bluebirds.
Bluebirds sometimes build more than one nest, as a diversion to predators.
The mother will take of the babies till they leave the nest The male and female will continue to take care of them after they leave the nest.
They will nest in tree cavities.
Yes, bluebirds have predators. Foxes, cats, and raccoon may eat the eggs or live young out of the nest. Other birds such as sparrows compete with bluebirds for nesting places. Sparrows often break eggs and kill babies.
Not usually, bluebirds normally nest closer to the ground than martins.
Bluebirds spend much of their time foraging for food. When they have babies in the nest, they spend much of their time caring for them.
They can easily fit out the entrance hole.
From March to June. In the south, they nest earlier, and may raise two broods.
Yes, then clean the box.
Bluebirds' Baby - 1938 is rated/received certificates of: USA:Approved USA:Passed (National Board of Review)
Sometimes bluebirds face competition with other birds over nesting sites. Another problem bluebirds have is a lack of natural habitat. In areas that are more developed there are less natural cavities for them to nest in.