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.
Familiarize yourself with typical sizes. Moles are the largest of the bunch, averaging 7 inches from tip to the end of a 1-inch hairless tail. Shrews are some of the smallest mammals in the world: mouse-sized and averaging just under 4 inches, excluding a 1-inch tail. Voles are usually more than 4 inches long, with longer 1 1/2-inch, furry tails.