No, they do not eat mice. They eat insects, seeds, and berries.
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.
Yes.
yes
no
Yes if they can.
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.
Eastern bluebirds are very nice birds and eat many garden pests.
No. Oranges eat mice.
Yes, but only small spiders.