Galapagos  sailing yachts

"The Campa war party were trotting in single file, incredibly swift, utterly silent. They were naked, painted dark green from head to foot. They carried spears and war-clubs. The strange thing about them was that they were hissing like snakes. Later we learned that the warriors believed that by so calling on the Anacondas they became invisible!" (Leonard Clark, The Rivers ran East)