Although no Screamers are ever seen in the book, they are heard - their scream is so loud as to be able to deafen and daze people far away from it. They are also the primary method of alarm for sleeping Myrmidons - only a Screamer can wake a Myrmidon quickly. They do not travel in groups. It is mentioned that when a human is close to the screamer while it screams it can peel away the skin on the insides of their ears.