A call stack is used for several related purposes, but the main reason for having one is to keep track of the point to which each active subroutine should return control when it finishes executing.
Though they are commonly mistaken for rodents due to the similarities they share with ground squirrels and marmots, moles are actually mammals. Eastern Mole. The most common mole in the United States is the eastern mole. Adults are typically about half a foot long with sleek, dark fur, long snouts, wide hands, and obscured eyes.
Voles are rodents about the size of a mouse that burrow underground. Voles have shorter tails and smaller ears and eyes than mice. Due to their similarities, they are sometimes known as meadow mice or field mice. Voles are also often mistaken for moles.