Wall barley, also known as Squirrel-tail barley, is a type of grass that is common in North America. It is a cool-season grass that grows in the spring and summer months. It is used as a forage crop for livestock and as a ground cover for erosion control. While wall barley is the most commonly used name for this grass, it has several synonyms including foxtail barley, hordeum jubatum, hedgehog barley, and bobtail barley. All of these names refer to the same grass, each name highlighting a different aspect of its physical appearance or growth habit. Regardless of the name used, wall barley is an important component of many ecosystems and agricultural practices in North America.