What physiological process causes the walrus skin to take on a noticeable reddish-pink hue?

Answer

Dilation of blood vessels near the surface to release heat

The striking color shift observed in walruses, moving from pale or grayish to a distinct reddish-pink tone, is not due to a change in underlying pigment, but rather a mechanism of blood flow regulation crucial for thermal balance. When walruses are resting in warmer air or actively basking, they intentionally dilate the blood vessels located close to the skin's surface. This action facilitates the release of excess heat, causing the skin to flush prominently. Conversely, when conserving heat, such as after active swimming or in cold conditions, blood is shunted away from the skin, resulting in a paler appearance. This circulatory adjustment is vital for managing thermal load during extended periods spent out of the water.

What physiological process causes the walrus skin to take on a noticeable reddish-pink hue?

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