Crabeaters, Weddells, and Leopards have lost their front flippers entirely, and their back ones are merged and closer to their bodies. My uneducated guess is that Fur Seals are a lot closer to their land roots than the pack ice seals. Fur Seals can walk around like dogs, more or less, on their four flippers, whereas the others move along like inchworms, or slither like snakes. When you think of a circus seal balancing a ball on its nose, that is the Fur Seal kind. They are also smaller than the pack ice seals I've seen.
Fur seals are also a beautiful, rich brown color, and are distinctly, well, furry looking.
The ones we saw were usually in groups of three or four, bounding about on ice floes or swimming together. I want to learn more about seals, now that I've seen some. The icebergs are distinctly different here also. They are dirty, not the blue and white ones of the Amundsen Sea. There are no large ice shelves in the Gerlache Straits.