Kujirotaria grandis
50 million years in the future, the majority of cetaceans have become extinct. Cetacean diversity has been in decline since the Miocene, and human persecution has not helped. Only a few lineages of dolphin have made it this far. The extinction of larger whales have left larger predatory niches open, to be filled by descendants of other taxa.
The great sea bear is descended from sea lions. It is completely marine, and is unable to stand on land; the hind feet have formed a semi-fused, flexible fluke. The great sea bear reaches lengths of up to eight meters. It is an apex predator; its diet consists of sharks, seabirds, marine reptiles, large fish and cephalopods, and smaller marine mammals. Sea bears have a distinctly flexible neck, and sometimes kill prey by thrashing it to pieces. Sea bears live solitary, except for mothers and offspring, who may stay together for over a year after birth.