Grasshoppers are strong insects with a well-protected body and sight that enables them to identify predators from afar. Some of their most common predators are beetles, birds, mice, snakes, and spiders. Yet, certain varieties of flies that spawn on or near grasshopper eggs are, perhaps, their most unusual predator. After the fly eggs hatch, the newborn flies eat the grasshopper eggs first, soon followed by the adult grasshopper. Nevertheless, humans represent the greatest threat to grasshoppers due to pesticide use and urbanization. In a small way, grasshoppers often fight back. Many species will spit a brown bitter liquid, commonly referred to as "tobacco juice," when handled by humans.