Like domestic cats, lions are obligate or “true” carnivores, meaning that they rely on nutrients that can only be found in animal flesh. Lions eat a large variety of prey, but the bulk of their diet is usually made up of medium and large ungulates, such as buffalo, wildebeest, giraffe, and zebra. Lions have been known to feed on more than 40 different species, but populations within a single ecosystem will typically be reliant on two or three key species of prey.

Source: Lion Landscapes