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Bees are cold blooded, but there is a common misconception that their bodies are at the same temperature as their surroundings. This is not so. If a bee's body temperature drops below about 25°C (75°F) it is unable to fly, and if its temperature falls to 15°C (50°F) it will become comatose. Any cooler and the bee will die.

When flying, a bee's flight muscles generate quite a lot of heat, but if the air temperature drops below about 17°C (54°F) it will start to lose heat faster than it can generate it. For this reason, at lower temperatures the bees will not venture far from the hive.

When it is really cold the bees will not leave the hive at all but will cluster on the comb, vibrating their wing muscles (without moving the wings) to generate heat. They will maintain the center of the cluster at about 36°C (95°F) and the cluster will tighten as the outside temperature falls. Bees on the outside of the cluster will move in as they start to get too cold.

As the outside temperature rises again in the spring, the cluster will loosen, and eventually the bees will start flying out of the hive again.

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11y ago

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