To reach Australia through the Malay Archipelago even at the lowest sea level of the last glacial maximum, a journey of at least 50 km over open sea between ancient Sunda and Sahul was necessary, so they must have accompanied humans on boats. Based on a comparison with these early fossils, dingo morphology has not changed over thousands of years. This suggests that no artificial selection has been applied over this period and that the dingo represents an early form of dog. They have lived, bred, and undergone natural selection in the wild, isolated from other canines until the arrival of European settlers, resulting in a unique canid. Whole genome sequencing indicates that dogs are a genetically divergent subspecies of the grey wolf, the dog is not a descendant of the extant grey wolf, but these are sister taxa which share a common ancestor from a ghost population of wolves that disappeared at the end of the Late Pleistocene. The dog and the dingo are not separate species. The dingo and the Basenji are basal members of the domestic dog clade. "The term basal taxon refers to a lineage that diverges early in the history of the group and lies on a branch that originates near the common ancestor of the group." Mitochondrial genome sequences indicates that the dingo falls within the domestic dog clade, and that the New Guinea singing dog is genetically closer to those dingoes that live in southeastern Australia than to those that live in the northwest. The dingo and New Guinea singing dog lineage can be traced back through the Malay Archipelago to Asia. Gene flow from the genetically divergent Tibetan wolf forms 2% of the dingo's genome, which likely represents ancient admixture in eastern Eurasia. The dingo is a medium-sized canid with a lean, hardy body that is designed for speed, agility, and stamina. The head is the widest part of the body, wedge-shaped, and large in proportion to the body. Captive dingoes are longer and heavier than wild dingoes, as they have access to better food and veterinary care. The average wild dingo male weighs and the female , compared with the captive male and the female . The average wild dingo male length is and the female , compared with the captive male and the female . The average wild dingo male stands at the shoulder height of and the female , compared with the captive male and the female . Dingoes rarely carry excess fat and the wild ones display exposed ribs. Dingoes from northern and northwestern Australia are often larger than those found in central and southern Australia.