What locomotion feature do walruses share structurally with sea lions (Otariidae)?

Answer

Ability to rotate hind flippers forward

When comparing the three extant pinniped families, the locomotion mechanism on land provides a critical distinction. Both sea lions (Otariidae) and walruses (Odobenidae) possess the capability to rotate their hind flippers forward beneath their bodies, allowing them to effectively 'walk' on land or ice, facilitating hauling out. In sharp contrast, true seals (Phocidae) cannot rotate their hind flippers forward and must move on land using a less efficient, undulating, or 'galumphing' motion. This shared adaptation regarding flipper mobility suggests a closer functional link in terrestrial movement, despite the walrus having evolved towards greater bulk and benthic specialization.

What locomotion feature do walruses share structurally with sea lions (Otariidae)?

#Videos

The Evolution of Seals, Sea Lions, and Walruses - YouTube

How the Walrus Got Its Tusks - YouTube

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