Houndeye
The common "houndeye" or "sound dog" is a pack-animal par excellence. A houndeye apart from its pack is an unhappy and vulnerable creature, but in groups of three or more they will exhibit resonant behavior, emitting destructive harmonics capable of rupturing the internal organs of their prey. Deafness and migraine headaches are only two of the symptoms reported by survivors of houndeye attacks. However, if well-fed, they will not engage in harmonic behavior except when threatened and during their seasonal mating spree.