Chalkydri are mythical creatures mentioned in the apocryphal Second Book of Enoch from the 1st century CE, often seen as an angelic species

Chalkydri (Ancient Greek: χαλκύδραι khalkýdrai, compound of χαλκός khalkós "brass, copper" + ὕδρα hýdra "hydra", "water-serpent" — lit. "brazen hydras", "copper serpents") are mythical creatures mentioned in the apocryphal Second Book of Enoch from the 1st century CE, often seen as an angelic species. In the narrative, chalkydri dwell near the Sun and ran its course around the Earth with it bringing heat and dew to the Earth. The chalkydri and phoenixes are described as creatures 900 measures in size with the head of a crocodile and the feet and tail like that of a lion, each having twelve wings, and are empurpled like the color of the rainbow.