The defenceless newborns sitting under the vicious sting are the scorpion's own
offspring, tended by their mother until they are big enough to survive on their own.

Unlike most other arachnids they are viviparous: rather than laying eggs they give
birth to live young. The juveniles are unable to feed or defend themselves, or
regulate their moisture levels - they need their mother's protection.

Source: www.newscientist.com