Skorpios is a giant scorpion who was sent by the earth goddess, Gaia, to kill Orion. He was sent to kill him because he threatened to kill all the beast of the earth. Skorpios stung him and he died. After that Zues made a Constellation of Skorpios because of his manliness. It is said that whenever the Constellation of Skorpios is in the sky, Orion is not and vice versa.
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http://www.theoi.com/Ther/Skorpios.htmlorionvsscorpio.JPG