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. principalis or nominate corax, is intermediate in size, and the bases of its neck feathers are whitish (not visible at a distance). One explanation for these genetic findings is that common ravens settled in California at least two million years ago and became separated from their relatives in Europe and Asia during an ice age.
Part of their success as a species is due to their omnivorous diet; they are extremely versatile and opportunistic in finding sources of nutrition, feeding on carrion, insects, cereal grains, berries, fruit, small animals, and food waste. An extinct color morph found only on the Faroes is known as the pied raven. Intergrades into the nominate subspecies in the Baikal region. One million years ago, a group from the California clade evolved into a new species, the Chihuahuan raven.
The common raven (Corvus corax), also known as the northern raven, is a large all-black passerine bird.
Found across the Northern Hemisphere, it is the most widely distributed of all corvids.
Despite their bulk, ravens are easily as agile in flight as their smaller cousins.