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.
The star-nosed mole is covered in very thick, blackish-brown, water-repellent fur, and has large scaled feet and a long, thick tail, which appears to function as a fat storage reserve for the spring breeding season. Adults are 15 to 20 cm (5.9 to 7.9 in) in length, weigh about 55 grams (2 oz), and have 44 teeth.