Xrafstar
Xrafstar or Khrafstra (; ) is a cover term in Zoroastrianism for the animals that are harmful or repulsive. They were considered creations of the Evil Spirit Angra Mainyu and killing them was seen as meritorious. In the Young Avesta and Middle Persian texts, the class of xrafstars includes frogs, reptiles, scorpions and insects like ants or wasps, whereas predators such as the wolf are not referred to as xrafstars, even though they too are considered to be creations of evil. Herodotus narrates about the practice of killing xrafstars among the Magi: "The Magi are a very peculiar race, different entirely  from the Egyptian priests, and indeed from all other men whatsoever. The Egyptian priests make it a point of religion not to kill any live animals except those which they offer in sacrifice. The Magi, on the contrary, kill animals of all kinds with their own hands, excepting dogs and men. They even seem to take a delight in the employment, and kill, as readily as they do other animals, ants and snakes, and such like flying or creeping things".