Instinctively, led by sense of smell and gravity, it makes its way to the pouch. Once in the pouch, the newborn attaches its mouth to a single teat, from which the newborn gets milk high in fat and nutrients. The male M. eugenii has a long duration of spermatogenesis and a long period of sperm transit in comparison with other mammals. Behavior Macropus eugenii are a very social species. Higher ranking individuals are usually males.
Dominance is determined by fighting ability, and the victor is the highest ranking individual.
Males wrestle with one another until one proves he is the strongest male. The strongest male then has a high chance of mating with a female and ultimately, reproducing. The hierarchy is generally based on size, which in turn is correlated with fighting ability. An individual with a larger height and elongated and more muscular forelimbs, will have a significant advantage over his rival while fighting. Display behavior is also used as a part of a courting ritual.