Chalkydri are mythical creatures mentioned in the apocryphal Second Book of Enoch, often considered an angelic species. In the narrative, chalkydri dwell near the Sun, running its course around the Earth and bringing heat and dew. The chalkydri and phoenixes are described as creatures 900 measures in size, with the head of a crocodile, the feet and tail of a lion, twelve wings, and a coloration like the rainbow. Both are referred to as "flying elements of the Sun" in the Second Book of Enoch. At sunrise, all chalkydri break into song with their counterparts, signalling the birds of the world to rejoice at the new day.