Found... The Honey Bees With Built-In Central Heating

Scientists have discovered 'heater' bees who keep the hive warm

From The Daily Mail:

Scientists have long attributed the success of the honey bee to the division of labour within the hive.

But thermal imaging research for a TV series has identified a previously unknown skill performed by a specialist bee that is vital for a colony's survival.

'Heater bees' use their bodies to provide a 'central heating' system, it has emerged.

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