Every winter in South Australia, giant cuttlefish aggregate along the six-kilometer rocky reef at Point Lowly. These “chameleons of the sea” are the largest cuttlefish in the world, reaching 60cm in length and 5kg in weight. The sole purpose of their migration is to spawn. During the winter months, male giant cuttlefish fight for the opportunity to mate. Each female cuttlefish is surrounded by many males. The male that earns the right to mate passes its spermatophore (sperm-containing packet) to the female. The female receives spermatophores from different males, then chooses the one that will be used to fertilize the eggs. After all, it is the sperm of the strongest male that should be used for reproduction. The female cuttlefish lays eggs under rocks which hatch after a few months.