Here are the three weirdest things about hummingbirds, as explained by Hank Green:
* Their legs are so light that they can't walk or jump
* Their wings produce lift on the downstroke and the upstroke
* Their metabolic system burns the sugar they drink so fast they can't store energy as fat
Check out the video for a more extensive look at hummingbird strangeness. --Ryan Cooper
The Week
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