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.
Out of the seven species that occur in North America, three inhabit lands east of the Rocky Mountains (Yates and Pedersen 1982). The eastern mole is the most common and its range is shown in figure 2. The star-nosed mole is most common in northeastern United States and southeastern Canada, sharing much of the same range as the hairy-tailed mole. The remaining four species are found west of the Rocky Mountains.