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Horned viper
This snake is one of the most dangerous on this list. In addition to the threatening appearance (though it looks like a dragon?), this snake «spits» very toxic poison, which can quickly take a person’s life. Her horns also fulfill their function: when fighting with the enemy, the viper rubs them against each other, making a specific, scaring sound. However, all these facts in no way prevent some extremals from keeping such pets at home as well as other, ordinary animals.