* Birds: Some species of birds, such as the lark bunting and the grasshopper sparrow, eat needle grass seeds.
* Rodents: Some species of rodents, such as the prairie vole and the deer mouse, eat needle grass seeds.
* Insects: Some species of insects, such as the grasshopper and the Mormon cricket, eat needle grass leaves.
* Fire: Needle grass is also a fire-adapted species. This means that it can tolerate and even thrive after fires. Fires can kill other plants that compete with needle grass for resources, such as water and sunlight. This can allow needle grass to grow more densely and produce more seeds.