1. The largest and heaviest Carnivoran to have ever existed, approaching an elephant in weight. The largest recorded was 6.85metres long and weighed 5.5tons.
2. Show the greatest sexual dimorphism known in mammals, with the females being one third the size of the males.
3. One recorded individual had an intestinal tract measuring 202metres.
4. Can hold their breathe for 80 minutes, longer than any other non-cetacean mammal.
5. Have the most flexible spines known for a mammal and can eat a fish off their back flippers.
6. Their large noses are used as sound amplifiers when defending territory.
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