Learned a new word today: Troglodyte.
a. A member of a fabulous or prehistoric race of people that lived in caves, dens, or holes.
b. A person considered to be reclusive, reactionary, out of date, or brutish.
a. An anthropoid ape, such as a gorilla or chimpanzee.
b. An animal that lives underground, as an ant or a worm.
Other forms: troglodytic and troglodytical.