Rev.9.10  They have tails like scorpions, and stings, and their power of hurting men for five months lies in their tails.
Rev.9.19  For the power of the horses is in their mouths and in their tails; their tails are like serpents, with heads, and by means of them they wound.
Rev.12.4  His tail swept down a third of the stars of heaven, and cast them to the earth. And the dragon stood before the woman who was about to bear a child, that he might devour her child when she brought it forth;