Moles
are mammals that burrow tunnels underground, feeding on grubs and worms. Though they have eyes they are almost completely blind and rely on their sense of smell to find the grubs that they eat. Though they are commonly thought of as nocturnal, this is not true. They work throughout the day in shifts of 4 hours; though they are not usually seen during the daytime because they tend to burrow deeper during the day hours, where it is cooler and less noisy. Moles can leave destructive tunnels in the lawn, and even holes they use for venting. Though the holes are troublesome, you should view them as a compliment, because moles usually only inhabit yards that are well maintained (with dirt that has low acidity).
Voles
are small rodents similar to a mouse, but with a stouter body, a shorter hairy tail, a slightly rounder head, and smaller ears and eyes. They are sometimes known as meadow mice or field mice. They range between 3 to 6 inches long and commonly eat greens like grass, clover, and the needles of Douglas fur trees.