A cockatrice is a mythical beast, essentially a two-legged dragon or serpent-like creature with a rooster's head. Described by Laurence Breiner as "an ornament in the drama and poetry of the Elizabethans", it was featured prominently in English thought and myth for centuries.
The caladrius, according to Roman mythology, is a snow-white bird that lives in the king's house. It is said to be able to take the sickness into itself and then fly away, dispersing the sickness and healing both itself and the sick person. The caladrius legend formed part of medieval bestiary materials, which typically provided a Christian moralization for the animals they discussed.