Bluebird

As the name implies, these are attractive birds with blue, or blue and red, plumage. Female birds are less brightly colored than males, although color patterns are similar and there is no noticeable difference in size between sexes.
Bluebirds are territorial, prefer open grassland with scattered trees and are cavity nesters.
Males identify potential nest sites and try to attract prospective female mates to those nesting sites with special behaviors that include singing and flapping wings, and then placing some material in a nesting box or cavity. If the female accepts the male and the nesting site, she alone builds the nest and incubates the eggs.
Symbol of cheerfulness, happiness, prosperity, hearth and home, good health, new births, the renewal of springtime, etc. Virtually any positive sentiments may be attached to the bluebird. Bluebirds are used to represent confidence in the positive aspect and egotism in the negative. A dead bluebird is a symbol of disillusionment, of the loss of innocence, and of transformation from the younger and naive to the older and wiser.

Cultural references:
Judy Garland's "Over the Rainbow"
Sailors
Literature

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