Most observations of animal suicide come from laboratories where the creatures have been kept under stress, sometimes deliberately, to see what will happen, sometimes from ignorance. A keeper repeatedly found young octopuses dead on the side of the tank. With great effort they had dragged themselves out of the water and clung to the glass, where they desiccated. The octopuses had been kept isolated, one per tank, in clean glass expanses, the water unrelieved by any life forms. The deaths stopped once the keeper leavened the tanks with corks and plastic seaweed. This was enough, though maybe just barely, to ward off sensory deprivation and despair.