Cladogram

It seems that the way characteristics are being more and more discovered the bone structure seems to change also. Environmental change altered in accordance with changes in food availability that are associated with climate conditions. Female fur seals are now born with a lower weight, those that survive and return to breed tend to be the bigger ones and they have their first pup later in life than they used to. Climatic conditions are typically associated with low krill availability, and reduce the survival and breeding success of fur seals.