As darkness falls and the air begins to cool, thousands of bats burst from the narrow mouth of their cave. The sky comes ...

Murmuration gets its name from the sound of "many flapping wings of a group of starlings ... "Starling Birds Murmuration in an Cloudy Sky during a Calm Sunset At..." Getty Images, 14 Feb.

which have flapping wings, offer the best of both worlds. The one seen here, named SmartBird, has a 6.5-foot wingspan and was modeled after a herring gull. It can cross the sky silently and ...

The drone’s wings span 2m and it weighs 480g including battery. Flying at its design speed of 5m/s, its wings are flapping at 2Hz, consuming 23W. Each wing is in two parts, hinged together, with the ...

When Anne Scott-Markle heard a bald eagle flapping in a big ponderosa pine near her rural Columbia Falls home last Thursday, she thought something may have been amiss. She could see the bird, which ...

But what it lacks in bulk, it makes up for in endurance—this scavenger can glide effortlessly for hours, riding thermal air currents without flapping its wings ... of the sky, past and present.