Cock. A very occult bird, much appreciated in ancient augury and symbolism. According to the Zohar, the cock crows three times before the death of a person; and in Russia and all Slavonian countries whenever a person is ill on the premises where a cock is kept, its crowing is held to be a sign of inevitable death, unless the bird crows at the hour of midnight, or immediately afterwards, when its crowing is considered natural. As the cock was sacred to Æsculapius, and a the latter was called the Soter (Saviour) who raised the dead to life, the Socratic exclamation “We owe a cock to Æculapius”, just before the Sage’s death, is very suggestive. As the cock Was always connected in symbology with the Sun (or solar gods), Death and Resurrection, it has found its appropriate place in the four Gospels in the prophecy about Peter repudiating his Master before the cock crowed thrice. The cock is the most magnetic and sensitive of all birds, hence its Greek name alectruon.
Source: H.P.Blavatsky - The Theosophical Glossary