Displaying a serpent devouring its own tail, the ouroboros is one of the oldest symbols ... the classic snake-eating snakes, is so famous for its considerable length and its venom.

Although venomous, it is categorized as "Least ... Snakes also feature in medicine with the Rod of Asclepius, a snake wrapped around a staff, a symbol of healing that is still prevalent today ...

This iconic snake, with its bulbous head and red, yellow, and black bands, is famous as much for its potent venom as for the many rhymes—"Red and yellow, kill a fellow; red and black ...