Hummingbirds can hover because they move their wings in a figure-8 motion, gaining lift from both sides
Aside from insects, they are the only animal that can fly upside down
They wings can move up to a speed of 200 strokes/sec
Hummingbirds enter a state of "torpor" at night - almost shutting down their heat (cut body temperature in half) and metabolic systems to compensate for not eating
Here's a PBS clip, with the link to the entire documentary on hummingbirds as well.
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