Ref: Johns Hopkins
A mole is a type of insectivore that lives under ground, burrowing holes. It feeds on small invertebrate animals living under ground. There are also similar-looking but herbivorous rodents called mole rats that enjoy a similar life-style and are commonly called "moles".
Moles are particularly disliked by gardeners and grounds-keepers whose lawns they ruin.
Many types of earth- burrowing machines take their names from moles.