From March to June. In the south, they nest earlier, and may raise two broods.
Bluebirds sometimes build more than one nest, as a diversion to predators.
They will nest in tree cavities.
Yes. They live in New York where the environment is suitable.
Eastern bluebirds are very nice birds and eat many garden pests.
Not usually, bluebirds normally nest closer to the ground than martins.
No, they do not.
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.
Bluebirds prefer open country, pastures, farmlands, clearings.
Yes, they do.
no
They can easily fit out the entrance hole.
Bluebirds sing to attract mates and warn other bluebirds not to enter their territory.