Christmas goblins, known as kallikantzaros in Greek folklore, are malevolent goblins that are believed to live underground but emerge during the twelve days of Christmas to cause trouble. They are described as having some animal-like features. According to lore, people used various methods to protect themselves from the goblins, such as leaving a colander or shoes by the fire to repel them, or burning incense and marking doors with crosses. There are also legends about babies born during the twelve days being in danger of transforming into demons.