They slither across lawns and pastures in a sort of formation, chewing grass, plants and even weeds. Only an inch or inch-and-a-half long, the caterpillars do not look particularly destructive. They slither across lawns and pastures in a sort of formation, chewing grass, plants and even weeds. Only an inch or inch-and-a-half long, the caterpillars do not look particularly destructive. Plants & Animals Ecology Phys.org – latest science and technology news stories