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Up until only a few years ago, it was thought by many scientists that Honey bee hives were kept warm by pupae in the brood and that the bees would often congregate there to warm themselves up from the pupae. Recently, this was found not to be the case when a new Honey bee job was discovered, that of “heater bees.” Bees of almost all ages can perform this function by either vibrating their abdomens or they can also decouple their wings from their muscles, allowing them to vigorously use these muscles without actually moving their wings. This can heat their bodies up to about 111° Fahrenheit (44° C), which is about 16° F (9° C) hotter than their normal body temperature.

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Sources:

http://www.amazon.com/gp/product/3540...
http://www.hobosonline.de/
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http://www.telegraph.co.uk/earth/wild...
http://en.wikipedia.org/wiki/Honey_bee
http://en.wikipedia.org/wiki/Queen_bee
http://en.wikipedia.org/wiki/Pollen
http://en.wikipedia.org/wiki/Propolis
http://www.orsba.org/htdocs/download/...
http://apiculturenyon.blogspot.de/20...
http://en.wikipedia.org/wiki/File:Hon...
http://www.nature.com/nature/journal/...