Which animal would be most closely relate to the walrus?

The animal most closely related to the walrus is the sea lion. Both belong to the pinniped group, which includes seals, sea lions, and walruses, all of which are marine mammals adapted to life in water. They share similar characteristics, such as flippers for swimming and a diet primarily consisting of marine prey. Additionally, walruses and sea lions are both part of the clade Pinnipedia, highlighting their evolutionary connection.