Harvesters are a species found in The Sphere (the main setting of Human Head's game Prey). It is unclear if they are sentient or not, but they appear to serve a vital role in maintaining the Sphere itself. They travel through organic tunnels which are inaccessible to humans, and are not seen to be used by any other species, and it is believed that they use these tunnels to hunt, and harvest protein for the Sphere.
Like many of the species living in the Sphere, the Harvesters appear to be cyborgs of a sort. There are two common varieties of the species. One equipped with mechanical legs, and one with an antigravity device which allows it to fly.
Harvesters are equipped with the Crawler Launcher.