The greater guinea pig is a wild relative of the domestic guinea pig. It has webbed toes and lives in wetlands, with long fur forming a crest on its neck.
Long fur forms a crest on its neck. It has no tail and has web-like skin between its toes.
It does not dig burrows and hides among tall, spiny plants in wetlands. During the rainy season, it may move to drier ground within its home range when water rises.
An extinction-risk assessment has not been added yet.