This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Caladrius (Medieval Bestiary)
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.
Medieval interpretations focused on the diagnostic potential of the bird: if it looks into the face of a sick person, the person will live; if it looks away, the person will die. This is compatible with the idea that the caladrius' look draws the sickness into itself; the bird is then said to fly up to the sun, where the disease is burned up and destroyed.