The Xenexians were a race of pale-skinned aliens with large skulls and long, splayed fingers. Their ancestral origins were hard to discern, because their bodies contained no trace of anything but Xenexian information. They have evolved into a race which excelled in abstract thinking, although they lack certain instinctual emotions like fear and passion. Their huge eyes lacked eyelids because they evolved past the need for sleep, a trait which allowed also them to see in minute detail. A Xenexian lacks a proper nose, instead having olfactory organs hidden in the flaps of their cheeks. The thumb and little fingers on each hand are opposable, and their mechanical abilities are known throughout the galaxy. Xenexian mating is a less than emotional experience, as the Xenexian race has lost the ability to procreate sexually. Instead, they bring genetic material to a Computer Mating Service for analysis against prospective mates. Xenexian children are created from genetic material from two parents, which is combined, fertilized, and incubated for a year. Their internal systems were different than most humanoid species, including the fact that Xenexian had just one lung.