This section temporarily contains information copied directly from Bulbapedia, and needs to be rewritten so not to be classified as plagiarism.
Dugtrio is a set of Diglett triplets sharing a single body. Each head has brown skin, black eyes, and a large, round, pink nose. Dugtrio's three heads think the same thoughts and act cooperatively. In order to make burrowing easier, each head will bob up and down to loosen the soil. Dugtrio can tunnel under the earth at 60 mph to a depth of 60 miles, triggering tremors and earthquakes. It is capable of burrowing endlessly.
Dugtrio lives in tunnels and caves under the earth. As shown in the anime, it sometimes lives in hollow trees in forests. It maintains the soil and plants trees to revitalize wooded areas.