Most birds get all the lift they need to fly with the downward stroke of their wings—meaning there’s no upward force being produced as they raise them back up. Hummingbirds, on the other hand, produce lift with both their upward and downward wing strokes, creating air vortices that the tiny birds use to fly with incredible maneuverability.
Hummingbirds flap their wings a blistering 12 to 80 times per second (depending on the species) when in flight. This can generate quite a bit of extra body heat, which must be dissipated somehow to prevent the birds from overheating. Now scientists think they understand a bit more about how these tiny creatures regulate body temperature.
Here’s a video of hummingbirds flying in slow motion. It’s really cool to see how different the speed of its wings move versus the stillness of its body. It’s like the video is in fast forward when you’re staring at the wings but completely stopped when you just see the body. I’ll never not be impressed by hummingbirds, they fly like how I imagine little robots to fly.