Around 45 million years ago, a 4.6 feet-tall (1.40 meters) flightless bird called Diatryma roamed the Geiseltal region in southern Saxony-Anhalt. An international team of researchers report on the ...

There are some animals, like mammals, reptiles, and amphibians that can fly to some extent even without wings. They, on the other hand, must force their body to take flight and keep them in the air.