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