Spider fighting or spider derby is a blood sport involving spiders that occurs in different forms in several areas of the world. Among them are the Philippines, Japan, and Singapore. The fights that occur in the Philippines and in Japan are staged between females of various species of web weavers. Female spiders will kill a rival if the loser does not quickly flee or receive the aid of a human handler. The contests that are staged in Singapore are fights between male jumping spiders. The males fight only for dominance, and ordinarily the loser will flee, though sometimes they will lose a leg in the fight.