Hummingbirds are the only birds that can fly backwards
Hummingbirds are the only birds that can fly in all directions — forward, backward, sideways, up, down, and hover in place. Their wings rotate in a figure-8 pattern rather than flapping up and down like other birds, generating lift on both the up and down stroke. A hummingbird can beat its wings up to 80 times per second and has a heart rate of 1,260 beats per minute during flight. Their metabolism is so fast that they must eat every 10–15 minutes or risk dying of starvation — some enter a torpor state at night to conserve energy.
Birds are defined by flight, but discovering that only one type evolved the specific wing geometry required to fly backwards makes the diversity of solutions to 'how to fly' feel more varied and strange.
“Hummingbirds are the only birds that fly backwards. Their wings rotate in a figure-8, beating up to 80×/sec. They have a heart rate of 1,260 bpm in flight and eat every 15 minutes or die. 🐦 #OddlyHuman”