Ravens are quite vigorous at defending their young and are usually successful at driving off perceived threats. They attack potential predators by flying at them and lunging with their large bills. Humans are occasionally attacked if they get close to a raven nest, though serious injuries are unlikely.

Are ravens vicious?

Corvids—the avian family that includes ravens and crows—are notorious for causing mischief to humans and animals alike. ... Crows have demonstrated the ability to recognize individual human faces and harass people who have harmed them. In the process, both birds might come of looking a little … dickish.

Do crows or ravens attack people?

The American Crow (previously Northwestern)

They are known to dive and strike humans not just once, but repetitively until the human in question has moved a good distance away from the nest. These attacks are very common in Vancouver; we have even had attacks on staff in our Science Park.