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.
A Little Bit About Moles. Moles are insectivores (insect-eating) and belong to the same family as shrews and bats. From the tip of their nose to their tail, moles vary in size from 4 to 8 inches. The have large paddle-like front feet with prominent claws designed for very efficient digging. Moles have very tiny eyes and lack external ears.