Many kinds of birds are used in Christian symbolism. The first to be so employed was the Dove; it stood for the Third Person of the Blessed Trinity, for when Jesus was baptized the Holy Ghost descended in bodily shape as a dove upon Him (Luke 3:22). It was also used as a symbol of peace, because a dove brought to Noah a bough of an olive-tree as a sign that the deluge of wrath was at an end. In early Christian art the Apostles and the faithful were generally represented as doves, the first because they were the instruments of the Holy Ghost, carrying peace to the world; the second because in their baptism they received the gift of reconciliation, entering with the dove (the Holy Ghost) into the Ark of God, the Church. Sometimes in symbolical writing it stands for rest: Who will give me wings like a dove, and I will be at rest? -- (Psalm 54:7); often for simplicity, innocence, and love: Be ye therefore wise as serpents and simple as doves (Matthew 10:16); Open to me, my sister, my love, my dove, my undefiled; One is my dove, my perfect one. (Cant., v, 2; vi, 8.) The Eagle is a symbol of Christ and His Divine nature, of regeneration by baptism; it is also an emblem of St. John the Evangelist. As the eagle can gaze upon the shining orb of the sun with steadfast eyes, so can Christ gaze undazzled upon the refulgent glory of God the Father. Dante refers to the strong eye of the eagle (Parad., i, 47, 48): --
The Pelican is a symbol of the atonement and the Redeemer. It was supposed to wound itself in order to feed its young with its blood and to bring to life those who were dead -- the "pelicane who stricketh blood out of its owne bodye to do others good" (Lyly, Euphues). Allusion is made to this belief in "Hamlet" (act iv): --
The Peacock in Byzantine and early Romanesque art was used to signify the Resurrection, because its flesh was thought to be incorruptible. (St. Augustine, City of God, xxi, c, iv.) It was also a symbol of pride. The Raven is a symbol of the Jews of confession and penance. The Cock is a symbol of vigilance, and also an emblem of St. Peter. The Vulture has always typified greed. Many other birds were used during the Middle Ages for symbolic and ecclesiological purposes; while the preachers of these centuries developed the symbolism of each one of these emblems to a degree that now seems far-fetched and often obscure, nevertheless, they made it clear that religious instruction can be gained from birds and even from the common things of life.
The Catholic Encyclopedia, Volume II. Published 1907. New York: Robert Appleton Company. Nihil Obstat, 1907. Remy Lafort, S.T.D., Censor. Imprimatur. +John M. Farley, Archbishop of New York
LAUCHERT, Geschichte des Physiologus (Strasburg, 1889); CAHIER, Mélanges d'archéol. (Paris, 1847-56); NEAL AND WEBB, The Symbolism of Churches and Church Ornaments (New York, 1896); DIDRON, Christian Iconography (London, 1851); EVANS, Animal Symbolism in Ecclesiastical Architecture (London, 1896); VIOLLET-LE-DUC, Dictionnaire raisonné de l'architecture française du XIe au XVIe siècle (Paris, 1853).