When faced with cold temperatures, an endotherm should

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Constricting blood vessels in the extremities reduces blood flow to the limbs, allowing the body to retain heat in the central core. This is a common strategy used by endotherms to conserve heat in colder temperatures. Grooming to remove oil secretions on fur or feathers, holding fur or feathers flat against the skin, and allowing water to displace air trapped near the skin under fur or feathers are all behaviors used to regulate heat in different situations, but may not be effective in cold temperatures. Shutting down countercurrent heat exchangers would actually cause the animal to lose heat, as these exchangers are used to conserve heat in the extremities.

When Faced with Cold Temperatures, an Endotherm Should