zsl-edge-of-existence:Sea otters only became strictly marine/aquatic animals around two million year
zsl-edge-of-existence:Sea otters only became strictly marine/aquatic animals around two million years ago, in contrast to the pinnipeds (seals/sea lions), which entered the water around 20 million years ago. In some ways, however, the sea otter has adapted even better to their ocean home than their distant cousins. Seals and sea lions must give birth and nurse their young on land, usually ice floes or beaches. Sea otters, in contrast, give birth to their young and nurse them in the water. -- source link