When Lunch Fights Back

The octopus spies a nice, tasty mantis shrimp. It swims over for a closer look at the small creature. Then—WHAM!—the mantis shrimp strikes a nasty blow with its hammer-like forelimb. The octopus shrinks back, defeated. That wasn''t such an easy meal after all . . . In nature, good defenses can mean the difference between surviving a predator''s attack and becoming its lunch. Some animals rely on s...