Gamayun,
“The Gamayun, like the Alkonost, is illustrated as a large bird figure with a woman’s head. Her iconic image represents happiness, prosperity and harmony. She is essentially a messenger for peace and sings beautiful melodies. She is considered to be prophetic in Russia as she is aware of everything that occurs within the world including man and animal, and she knows all amongst the gods and heroes. She lives on an island in the East near the Euphrates River or Eden. The Pythoness is not usually depicted with the Alkonost nor Siren, she is permanently alone knowing the secret fate of humans and the world.
“Gamayun cooperated with pagan Russian gods, notably Kryshen, Kolyada and Dazhbog, and Veles. She is seen as a personification of Veles—a renowned deity of wisdom, who keeps secrets regarding the world and man’s creation. She is aware of the true nature of all the gods and humans, and sang in the Book of the Vedas. The being’s hymns are believed to be divine and to have magical properties, her voice is difficult to understand and decipher, but the few humans who can comprehend her words can have their future prophesied and opulence as a gift. In contrast to the Alkonost, the bird does not derive from ancient Greece but from Iranian mythology, ultimately gaining recognition in Russia.”
(Information found on ancient-origins.net)