A group of ravens is typically referred to as an unkindness, although they do have several different names such as conspiracy, treachery, rave and congress and most people simply use the term “flock.” Although ravens are in the crow family, they are heftier and have heavier beaks, making a guttural croaking sound.
For you literary buffs, “The Raven,” a poem by Edgar Allan Poe, was first published in 1845 and describes a talking raven’s mysterious visit to a distraught lover who is ultimately descending into madness.