In these Scorpions(order Scorpiones,family Buthidae),the sternum of the cephalothorax is roughly triangular. Some legs have spines on the tibiae. Young are born live and climb on to the mother's back. Nymphs may take several years to mature. In a wide variety of habitants,ranging from desert to moist forest,where they found in rock cracks and underneath stones,logs and bark. Most of the dangerous scorpions belong to this family. Their powerful venom paralyzes the muscles,including those of the respiratory system and the heart.