[Ayumi_lover]

Yeap, in Russian mythology it's a bird of happiness, I actually thought it's an international sign

The mythology of the bluebird of happiness has deep roots that go back thousands of years. Indigenous cultures across the globe hold similar myths and beliefs about the bluebird. It is a widely accepted 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.

Soure: http://en.wikipedia.org/wiki/Bluebird_of_happiness