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. There are at least eight subspecies.
A mature common raven ranges between 56 and 69 cm in length. Recorded weights range from 0.69 to 1,63 kg. The common raven usually lives from 10 to 15 years in the wild, although some ravens were registered to have had a lifespan of 40 years.
The common ravens usually travel in pairs, although young birds may travel in flocks. Relationships between Common Ravens are often quarrelsome, yet they demonstrate considerable devotion to their families.
Common raven has coexisted with humans for thousands of years and in some areas has been so numerous that it is considered a pest. Part of its success comes from its omnivorous diet; Common Ravens are extremely versatile and opportunistic in finding sources of nutrition, feeding on insects, cereal grains, fruit, small animals, and food waste.
The raven lays its eggs in February when it starts hatching too. During this period, the female relies on the help of the male. Without it, the eggs would freeze. The incubation is about 21 days.