Seals, walruses, and other mammals in the pinniped family are most related to bears and this furry human companion

Because sight is limited in the depths of water, marine mammals rely on this to communicate

As close relatives to elephants, walruses have two of these

Offspring of sea lions, and small canines, are called this

Dory mimics this communication method that marine mammals use to magnify their sounds in water
https://www.youtube.com/watch?v=UBRvZ6wSVGQ

This protective layer of fat is up to 11 inches thick on whales

These adorable sea pups have been observed holding hands with companions, and have favorite rocks with which they open shells

To camouflage themselves in water, these mammals at the center of Sea World controversy are black and white

As mammals, whales, dolphins, walruses, and other marine mammals birth this many offspring at a time