Plato (c. 425 - 348 BC) refers to Cerberus' composite nature, citing Cerberus, along with Scylla and the Chimera, as an example from ancient fables of a creature composed of many animal forms grown together in one. Euphorion of Chalcis (3rd century BC) describes Cerberus as having multiple snake tails, and eyes that flashed, like sparks from a blacksmith's forge, or the volcaninc Mount Etna. From Euphorion, also comes the first mention of a story which told that at Heraclea Pontica, where Cerberus was brought out of the underworld, by Heracles, Cerberus vomited bile from which the poisonous aconite plant grew up.