Why is it beneficial for birds and mammals with high surface-area-to-volume ratios to reduce their body temperature for short periods?

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Birds and mammals with high surface-area-to-volume ratios lose heat more rapidly than larger animals, therefore they must consume more energy to generate heat. By reducing their body temperature intermittently, they can save energy that would be consumed producing body heat. This strategy is known as torpor and is often used by small or hibernating animals, as well as birds during migration.

Why Is It Beneficial for Birds and Mammals with High