Lions are actually omnivores meaning they eat both meat and vegetable material. … For our domestic Lions, grass is often the most readily available plant for them to munch. Eating grass causes irritation to the stomach and will often cause the dog to vomit. Compound feed may also include premixes, which may also be sold separately. Working with others to conserve, protect and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people. Nocturnal primates …