Chile also claims of Antarctica as part of its territory (Chilean Antarctic Territory). Polar deserts cover much of the ice-free areas of the Arctic and Antarctic. PSCs form more readily in the extreme cold of the Arctic and Antarctic stratosphere. They cover the western and eastern sides of the Antarctic and Arctic regions respectively. The expression above is always applicable for latitudes between the Arctic Circle and Antarctic Circle. Krill and copepods are prey species in Australian and Antarctic waters. The course must include set control points at latitudes outside the Arctic and Antarctic circles. Ocean currents in the newly formed Antarctic or Southern Ocean created a circumpolar current. Australia issues postage stamps for the Australian Antarctic Territory. Weddell seals are top predators in the Antarctic. There is also evidence for widespread glacier retreat around the Antarctic Peninsula. Byrd used New Zealand as his departure point for several of his Antarctic expeditions. Tasmania has a high concentration of Antarctic and Southern Ocean scientists. There are many glaciers in the Antarctic. This is a list of Antarctic and subantarctic islands.