Some believe that the bluebird is a symbol of joy and hope, or that good news will be arriving soon. Others think bluebirds represent a connection between the living and the dead.
Some Native American tribes consider the bluebird a spirit in animal form that symbolizes the dawn of a new day; others associate the friendly bird with the sun. The Iroquois believe that the bluebird is a harbinger of spring that fights off the evil demigod of winter, Tawiscaron.
According to folklore, many Native Americans hung dry gourds to entice bluebirds to nest near their settlements so they can enjoy their enchanting songs of happiness and hope. Just gazing upon one of the little flying cobalt creatures of contentment is said to bring joy. (Credit to https://www.livehappy.com/practice/the-bluebird-of-happiness for this information).
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The Nature of Maine 