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Bees are amazing. They all huddle together and vibrate their bodies to generate heat to stay warm when it’s cold. They surround the Queen to keep her in the center where it can be almost 100°F! 
They also use the same strategy more intensely to kill hornet invaders. A handful of bees will swarm the intruder, surround it and vibrate to kill it with heat. Research shows they can generate heat up to 117°F when they do it for defense, which is mind-blowing. Nature kicks ass, man.
After the cold snap I've been worried about my beehives - it doesn't get super cold here during winter. I don't think it's gone below zero in my memories of living in Georgia! A week of below freezing really worried me. 
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The weather is more mild this week and the bees are out and about doing bee business, so I'm relieved and thrilled. I can't wait for spring!