Aitvaras is a household spirit in Lithuanian mythology. Other names are: Kaukas, Pūkis, Damavykas, Sparyžius, Koklikas, Gausinėlis, Žaltvikšas, and Spirukas. Aitvaras is identical to the Latvian Pūkis and the Finnish Maahiset.
An Aitvaras looks like a dwarf or a white or black rooster with a fiery tail. An Aitvaras may hatch from an egg of a 9-12 year old rooster. If the Aitvaras dies, he becomes a spark.
In many cases, this Lithuanian creature is described as having the appearance of a rooster while indoors and the appearance of a dragon outdoors.
An Aitvaras will lodge itself in a house and will most often refuse to leave. It brings both good and bad luck to the inhabitants of the house. According to many, an Aitvaras can be purchased from the devil - the price being that person's soul.