All known scorpion species possess venom and use it primarily to kill or paralyze their prey and eat it. In general, the venom acts very fast and allow a scorpion to catch the prey easily. However, as a general rule scorpions kill their prey violently with force if they can, as opposed to using venom. They also may attack the predators with their venom.

The venom is a mixture of compounds (neurotoxins, enzyme inhibitors, etc.) They all cause different effects and are also aimed on different creatures to poison. Each compound is made and stored in a pair of glandular sacs. A scorpion itself chooses an amount of poison to release. Of the 1,000+ known species of scorpion, only 25 have venom that is deadly to humans; most of those belong to the family Buthidae.

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More Info: Wikipedia