I WARNED YOU: With its bright colors, this grasshopper has no trouble being noticed. That's actually a good thing. Red and blue are warning colors that tell predators to stay away. If a predator tries to eat the grasshopper anyway, it will get a surprise. When attacked, this grasshopper starts to make foam. And the foam tastes terrible! Photo ) August Sycholt, Age Fotostock America © 2005 National Geographic Society. All rights reserved.