Ross, Weddell, crabeater, leopard, fur and elephant seals. Fur seals are the smallest, with adult females weighing only 150 kg, while male elephant seals can weigh 4000 kg.
Seals are carnivorous animals.
Crabeaters, the most common seal, live almost exclusively on krill, but the leopard seal's diet also includes penguins and small seals. Seals spend much of their time under the sea ice in Antarctica, experiencing the relatively 'warm' sea temperatures. Weddell seals breed on the stable sea-ice and return to the same area each year. They eat fish and squid, and spend most of their time under the ice, only surfacing to breath out of tidal cracks in the ice sheet. Tidal cracks are produced because the sea ice is anchored to land.