Antarctic Krill grow to around 6 cm (2.4 in). Some of the most common examples of Antarctic animals and plants, which we will be discussing in detail, include: Animals that live in Antarctica are mainly aquatic, such as seals, penguins, other birds and some marine invertebrates and cetaceans. Antarctic animals - The most abundant and best known animals from the southern continent, penguins, whales seals, albatrosses, other seabirds and a range of invertebrates you may have not heard of such as krill which form the basis of the Antarctic food web. Arctic Animals A List of Arctic Wildlife Antarctic animals - south polar. The snow petrel is one of the Antarctic's smallest, yet most beautiful, animals. This small, shrimp-like crustacean is found in vast numbers in the Southern Ocean, forming groups called swarms which can be seen from space. They are pure white in colour – apart from their black eyes and beak. However, among smaller marine animals generally assumed to be the same in the Antarctica and the Arctic, more detailed studies of each population have often—but not always—revealed differences, show… The large animals often migrate between the two, and smaller animals are expected to be able to spread via underwater currents. Antarctic Krill (Euphausia superba) It may be small, but the Antarctic Krill is one of the most important animals in the Antarctic food chain. At least 235 marine species are found in both Antarctica and the Arctic, ranging in size from whales and birds to small marine snails, sea cucumbers, and mud-dwelling worms. They are about the same size as a pigeon but they are fascinating because, even though they are so small, they are mighty and manage to survive the extreme Antarctic conditions and wind-chill.