This paper examines animal motifs related to Cuchulain in Ulster Cycle, especially Lady Gregory’s Cuchulain of Muirthemne and Celtic culture. In the preface of the text Yeats said that she will have given Ireland its Mabinogion, its Morte d’Arthur, its Nibelungenlied. The Ulster sagas are documents surviving from a Celtic culture unaffected by the Latin civilization of the rest of Europe. Set a century before the time of Christ, the Ulster stories posit an older world than any known in other European vernaculars. The narrative materials were transcribed as early as 8th century continued to be part of living literature until 18th. Esteem for the Ulster Cycle passed into English during the 19th century, when nationalists searched ancient literature for heroes to replace those imposed on Irish children by English-run schools. During the generation of Lady Gregory, William Butler Yeats and John Millington Synge the Red Branch Cycle fostered widespread adaptation in English. Lady Gregory expected to let Irish students know that the Cuchulain stories were put into permanent literary form at about the same date as Beowulf, some 100 to 250 years before the Scandinavian mythology, at least 200 years before the oldest Charlemagne romance, and probably 300 years before the earliest draft of Nibelungenlied. In Cuchulain of Muirthemne there are twenty stories in English. Lady Grogery have exchanged for the grotesque accounts of Cuchulain’s distortion into the appearance of a god. In the Cuchulain’s stories still remains the ancient heart of Ireland and Celtic culture. In the Celtic supernatural world animals can talk, move about like humans, jest, warn and shapeshift. The Celts not only relied on animals for their survival but they respect them, learned them, and honoured them. The legendary Irish warrior and solar hero, Cuchulain, son of the god Lugh, exhibited the ‘hero light,’ a flaming aura, around his head when he entered the state of battle frenzy. As a lineage of Angus the hero fell in love with a swan goddess Fand. And was unsuccessfully wooed by the Morrigan in her raven aspect. Cuchulain, whose name means “Culan’s Hound,” was a Gaelic hero likened in his exploits to both the Greek Hercules and Achilles. He is said to have been able to perform a ‘salmon’s leap.’ In the War for the Bull of Cuailgne the hero single- handedly defends Ulster against the depredations of Connacht, as led by Medb and Ailill. The young Cuchulain, a superhuman, semi-divine hero has two chariot- horses, the Black of Saingliu and the Grey of Macha. The clairvoyante Grey cries tears of blood at the foreknowledge of his death. when the Ulster hero Cuchulain is finally killed, he has such a fearsome reputation that it is not until one of the raven-goddesses alights on his shoulder that his enemies believe he is dead and dare to approach and behead him. To the Celts, animals were special and central to all aspects of their world