The Pacific degu (Octodon pacificus), also known as the Mocha Island degu, is a new species of degu in the family Octodontidae. It is endemic to Mocha Island, Chile. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss. It was classified in 1994 by Dr. Rainer Hutterer. Like its close relative the Common degu, the pacific degu is diurnal. This species is said to have relatively primitive octodontid features, including long fur and a tail lacking a substantial tuft, a feature common amongst other octodons.