Raven is the common name given to the largest species of passerine birds in the genus Corvus. Corvids are also commonly referred to as crows and other species in the same genus include jackdaws and rooks.
Ravens have high intelligence and are perhaps the smartest birds. Their intelligence might be on par with canids such as wolves and some breeds of dog.
An obsolete collective noun for a group of ravens (or at least the Common Raven) is an "unkindness".