The dark, smudgy streaks on Xavi Bou's photographs suggest the jerky ink tracks created by a malfunctioning printer, but they actually record the various patterns birds trace while flying in flocks.

Flight is truly remarkable, no matter which way you look at it. And while it seems easy enough for the tiniest insects to ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Most bird species don’t fly above a few thousand feet in ...