Of the birds classified as perching birds or 'songbirds,' the Common Raven is the largest, the size of a hawk. Often its deep croaking call will alert the observer to a pair of ravens soaring high ...

It is sort of a drone and is inspired by the agility of birds like crows and ravens. It can walk, hop, and even fly. Raven adapts bird biomechanics to robotic locomotion. Raven has been designed ...