A twig suddenly by. Just as suddenly l, it moves-- then stips on a nearby tree. A vine moves slowly up a plant,and a brown leaf hops across the forest floor. Your eyes aren't playing tricks on you. The twig isn't really a twig-- it's an insect. The green vine is a sneke, and the jumping leaf is a leaf-litter toad. In the rain forest in Panama, things sometimes require a closer look.