Body hair is rare, usually apparent only on chieftains or specific breeds. Growlers reproduce sexually, and have males and females called bulls and mommas, respectively. Though less physically imposing than bulls, mommas compensate by embracing a much meaner attitude, and are generally more hostile than males. Female pups are nearly indistinguishable from male pups until they reach about two or three months old, at which point the female traits begin to manifest in full. Growler pups are born live, and fully capable of hunting just minutes after birth.
Growlers mature rapidly, taking about eleven months to go from pup to full-grown adult.
Growler body and muscle tissues are extremely dense, layered to protect the vital internal organs. Their tough, leathery hide can resist most types of cuts and abrasions, and the compact heavy muscle tissue tends to blunt kinetic trauma. All internal organs are supported and protected by the growler s thick skeletal system. Their rib-cage is an almost solid latticework that provides a shield for their heart, lungs, and other vital organs. Perhaps the most remarkable thing about the growlers is their digestive system.