Hummingbirds are adorable.
They also have such a fast metabolism that they can't ever stop eating. Because of this, the only way they can survive is to literally hibernate every night! They lower their body temperature and enter torpor.
In fact, some of them drop their temperature by as much as 33 degrees celsius. Only true hibernators go lower.
And then they wake up and start raiding everyone's nectar. They're just plain amazing little things.
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