For the same reason you do. Bluebirds eat to gain energy to complete the basic functions of life.
No, they do not.
Yes, the eat caterpillars.
No, they do not.
Bluebirds live on the continent of North America. There are different species in the Eastern, Mountain and Western portions of the continent.
No, they do not eat mice. They eat insects, seeds, and berries.
Yes.
no
yes
Yes if they can.
Yes. They live in western Canada.
Eastern bluebirds are very nice birds and eat many garden pests.