Environment temperate forests
Organization solitary, unkindness (2-4 swarms), or murder (5-10 swarms)
A raven swarm is a disorienting mass of angered birds. Raven swarms have the same general characteristics and habitat of normal ravens.
Raven Swarm from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.