Growlers are alien life-forms of remarkable complexity and strength.
Every aspect of their biology is oriented towards survival. If the evolution of a species occurs through a process of natural selection, growlers are examples of natural selection run rampant. Their ability to adapt to new environmental conditions is nothing short of astonishing. This versatility makes blanket statements about growlers difficult, as different breeds of growlers show different physical and social adaptations. An adult growler stands approximately three to four meters tall, and weighs over two thousand kilograms, nearly all of it dense muscle and bone tissue.