The symbolic meaning of bird tattoo is very rich. It can be a symbol of self nature and spirituality, also a symbol of spiritual transformation and sublimation. It can express a kind of growth and separation, or be related to freedom. Different birds have different meanings.
Birds are connected with divinity and the belonging of human soul. Just as self nature endows, guides and heals human soul life, birds symbolize the belonging, admiration and awe of human beings to self nature. Birds flying in the long air also symbolize the connection between human beings and self nature. In mythology, birds are the messengers of heaven and the intermediary between heaven and earth.
Source: @moi_tapttoo