Birds have feathers and a beak and lay hard-shelled eggs. Many birds are able to fly using their wings, but others such as ostriches are flightless and unable to fly. Some birds like penguins instead ...

Abstract: Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal propagation in wireless networks. By smartly tuning the signal reflection via a large number of ...

The Araripe Manakin (Antilophia bokermanni) is one of the rarest birds in the world, found only in a tiny forested valley in Brazil at the base of the Araripe Plateau. This critically endangered ...