Kill or die. Flee or perish. Such life and death duels are fought daily in the wild. Every conceivable trick is used by hunter and hunted - traps and lures, warnings and deception, ambush and camouflage. An orchid turns out to be a predatory flower mantis. Caterpillars look like snakes. In Patagonia, killer whales ambush sea-lions in the surf. These desperate battles between assassins and their victims have sharpened the skills of both in the art of pursuit and evasion.