Thestrals use a combination of grunts, snorts, bleats and mews to warn other Thestrals of danger and to establish dominance. They also perform particular motions with their tails, ears, heads and hooves to communicate with each other and to ward off predators.

When alarmed, Thestrals stomp their hooves and snort to warn others of danger. They may also “flag” or raise their tails which are distress signals. When Thestrals are running, they can easily follow each other by looking for the black tails.