The common raven (Corvus corax) is a large all-black passerine bird. It is the most widely distributed of all corvids, found across the Northern Hemisphere.Common ravens have coexisted with humans for thousands of years and in some areas have been so numerous that people have regarded them as pests.They display ability in problem-solving, as well as other cognitive processes such as imitation and insight. Extremly intelligent, but also mysterious; cryptic and poetic. Likes to torment writers. 