A Lithuanian household spirit that resembles a cock while indoors, but outdoors appears as a dragon about two feet long, with a serpentine body and four legs. In some districts is has wings and flies through the air trailing fire. It may hatch from an egg of a 9- to 12 year old rooter, and if it dies it becomes a spark.

An Aitvaras will lodge itself in a house, refusing to leave. Its presence brings riches into the household, but the wealth is usually stolen from neighbors. An Aitvaras can be purchased from the Devil, but the price is the buyers soul. Once bought, it is nearly impossible to get rid of. If injured, it can be healed just by touching the ground.