The Wikipedia description on Cygnus constellation says that this constellation may be indicating the myth of Stymphalian Birds, one of the 12 labors of Hercules: (see the area marked red in the following article)
(reference---Wikipedia article on Cygnus constellation)
The constellation can be represented as looking like a wide winged, long necked bird, in graceful flight . In Greek mythology, it has been identified with several different legendary swans. Zeus disguised himself as a swan to seduce Leda, who gave birth to the Gemini, Helen of Troy, and Clytemnestra;Orpheus was transformed into a swan after his murder, and was said to have been placed in the sky next to his lyre (Lyra); and the King Cycnus was transformed into a swan.
In Ovid's Metamorphoses, there are three people named Cygnus, all of whom are transformed into swans. Alongside Cycnus, noted above, he mentions a boy from Tempe who commits suicide when Phyllius refuses to give him a tamed bull that he demands, but is transformed into a swan and flies away. He also mentions a son of Neptune who is an invulnerable warrior in the Trojan War who is eventually defeated by Achilles, but Neptune saves him by transforming him into a swan.
Cygnus, together with other constellations in the Zodiac sign of Sagittarius (specifically Lyra and Aquila, together with Sagittarius ), may be a significant part of the origin of the myth of the Stymphalian Birds, one of The Twelve Labours of Heracles.
Krishna's story
Krishna also kills a giant stroke, which is similar to this story of Hercules.