I think its the Polar bear. It is the largest land animal and carnivore but sometimes we regard it is a marine mammal because it spends many months of the year at sea.
The Polar bear is an arctic mammal, not antarctic, they do not live in Antarctica.
The biggest antarctic marine mammal that i can think of is the Elephant seal.
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The largest Antarctic marine mammal is the southern elephant seal (Mirounga leonina). This species of seal can weigh over 8,800 pounds and reach lengths of up to 20 feet. They are known for their large size and loud vocalizations during the breeding season.
The largest predatory mammal is the polar bear (Ursus maritimus). They are the largest land carnivores and primarily feed on seals and other marine mammals in the Arctic region.
The largest mammal in Arkansas is the American black bear, which can weigh up to 600 pounds. The smallest mammal in Arkansas is the southeastern shrew, which is about 3-4 inches in length.
The largest desert in the world is the Antarctic Desert, which covers the continent of Antarctica. While it is not a hot desert like the Sahara, the Antarctic Desert is the largest desert in terms of area, with extremely cold and dry conditions.
The only mammal that can live in Antarctica is the Antarctic mite (Belgica antarctica), a tiny, extremophile arthropod that is able to survive in the harsh conditions of the continent.
The sperm whale is the largest mammal with teeth. They have the largest teeth of any animal, which can measure up to 8 inches in length.