Network of rabbit burrows
Warren
A warren is a network of interconnected burrows dug by rabbits.
Domestic warrens are artificial, enclosed establishments of animal husbandry dedicated to the raising of rabbits for meat and fur. The term "warren" evolved from the medieval Anglo-Norman concept of free warren—essentially, the equivalent of a hunting license for small game in a given area of woodland.
Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Dominicus Johannes Bergsma (see Commons), Wikimedia Commons.