Humans originated on the planet Earth. As the Latin word for their homeworld is "Terra" (the official name for the planet since the 22nd Century), Humans are sometimes referred to as "Terrans". Occasionally the term Terran is used to distinguish Humans living on Earth from those resident on colonies on other planets and moons. Some people use the adjective "Terran" to refer to subjects or institutions associated with Humanity (Terran cuisine, Terran literature, Terran art, etc).
Humanity were founding members of the Star Federation.
Bilaterally symmetrical bipedal primates, Humans are a warm-blooded humanoid species with an average lifespan of around 100 years, although some individuals have achieved a much older age.
The Human species is one of the more distinct sentient groups present in the Milky Way Galaxy as, while they do not possess any dominant or noticeable bony ridges around their face or on their bodies as is common to many races throughout space, they do possess a great deal of phenotypic diversity within their species. Skin color, eye color, blood type, facial structures, hair color and hair type varies considerably between individuals and makes nearly every single Human distinct in appearance from the next. An exception to this is in the case of identical twins, an anomaly that occurs in approximately three in every 1,000 Human births.
They have two sexes, as is common to many humanoid species. The female of the species is fertile once a month after she reaches puberty (between the age of twelve and sixteen) until the onset of a biochemical stage known as menopause (between the age of 45 and 55). Human gestation lasts nine months. The make-up of Human DNA structure is significant, as, with some modifications, it allows them to cross breed successfully with a wide range of other races across the galaxy, including Calandrians and Kilrathians.
Humans are not as physically strong as some species such as Calandrians, but they are resilient. They can survive with one lung or kidney (they have two of each normally), and they can go days without water and weeks without food due to their bodies' ability to conserve water and live off stored fat respectively. Their bodies' efficient temperature regulation allows them to resist and survive cold temperatures that would adversely affect other species such as Darach, or high temperatures that would be uncomfortable for other species such as Shammatans.