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In Korea, throwing both upper and lower teeth on the roof was common.[2] The practice is rooted around the Korean national bird, the magpie. It is said that if the magpie finds a tooth on the roof, it will bring good luck.[3] Some scholars think the myth derived from the word 까치 (Ka-chi) which was a middle Korean word for magpies that sounds similar to "new teeth", or because of the significance of magpies in Korean mythology as a messenger between gods and humans.[citation needed]