Ant Death Spiral: A circle of army ants, each one following the ant in front (because they use scent/pheromones to follow each others' trails since they are blind), becomes locked into a circular mill. They will continue to circle each other until they all die.
reginasworld: "This model head is reportedly an executed Chinese Yangstze river pirate. It is made of plaster. The long ponytail is real human hair. It is particularly gruesome because it depicts the head in great anatomical detail. Arteries, veins and spinal cord are accurately modelled across the severed neck. The head also has its own bloodstained carrying box. The origins and purpose of the model are uncertain."