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.
Moles and shrews belong to the order Insectivora and as the name suggests feed primarily on insects and invertebrates. Moles live underground and are specialized for life underground. Their small eyes and the openings of the ears are concealed in the fur, and there are no external ears.