An curved arrow pointing right. A drone that uses retractable feather wings, mimicking the natural flight of birds, has been designed by researchers in Switzerland. More from Tech A drone that ...

For centuries, scientists have observed that animals in warmer climates have longer limbs—a pattern known as Allen's Rule.

It can reach top speeds of to 17 mph. It's made from aluminium and fibreglass, using hydrofoils shaped like bird wings to make the device glide across the water. They cost $1000 to buy from the ...

According to the Cornell Lab or Ornithology, there are four general wing shapes that allow birds to do specific things, such ...