Grox are large reptilian creatures found all across the Milky Way Galaxy in Games Workshop's Warhammer 40,000 universe. Originating from the Solomon system, these creatures spread throughout the galaxy when the system was absorbed into the Imperium of Man, after Imperial settlers discovered how useful they are. A grox can survive in almost any environment and thrive on even the most indigestible food. Grox meat itself is also extremely palatable and nutritious. Because of their value as livestock they have since been introduced to other worlds throughout the entire galaxy, so that the Grox is now the most common type of livestock animal throughout the Imperium.
The only drawback to the Grox is their aggressive and vicious temperament. They will usually charge any creature on sight, including other Grox. They are also large, fast and dangerous beasts, about five meters long and well-muscled. They are territorial and like their privacy, so attempting to herd Grox together would easily drive them into a rage. The solution used is to lobotomize most of the stock while keeping the breeding animals suppressed with electro-pulsers wired directly into their small brains. Even with these precautions accidents still happen, and Grox are usually kept on agri-worlds (planets which are used for agricultural purposes only) and isolated from human settlements.