Photos shared to social media claim to depict a swarm of starlings flying through the air often, incredibly, in the shape of ...

So even when the bird glides or soars, the wing shape helps keep it up in the air. When a bird isn’t flying, it folds its wings neatly and tucks them against its body, out of the way.

But high-speed cameras show us what makes these birds perfect flying machines ... and fireworks. The wings of some species flap up to a hundred times per second. Their heart rate can exceed ...