Walrus. A warm sunbathing walrus is dark red, but when it returns from a deep dive in the ocean its skin is almost white. To conserve oxygen on long dives the walrus is able to reduce blood flow to the skin! (Odobenus rosmarus) Round Island, Walrus Islands State Game Sanctuary, Alaska, USA. Photo by Hal BrindleyWalrus (Odobenus rosmarus).

A warm sunbathing walrus is dark red, but when it returns from a deep dive in the ocean its skin is almost white. To conserve oxygen on long dives the walrus is able to reduce blood flow to the skin!

Round Island, Walrus Islands State Game Sanctuary, Alaska, USA. Photo by Hal Brindley

Walrus. A warm sunbathing walrus is dark red, but when it returns from a deep dive in the ocean its skin is almost white. To conserve oxygen on long dives the walrus is able to reduce blood flow to the skin! (Odobenus rosmarus) Round Island, Walrus Islands State Game Sanctuary, Alaska, USA. Photo by Hal Brindley