Halo Species

"''It's 2559, Cortana and the Created have turned on the creators (Humans). As a stitch effort to ensure the human race survives if they are overcome by the Guardians, a Forerunner peacekeeping A.R., the Unified Earth Government(UEG) has sent the United Nations Space Command (UNSC) ships, Autumn Clash, Firestorm Sky, One for All, Here We Go, Hingehead's Doom, I'm here, and 404 Not Found, on an expedition to a nearby galaxy. Their intent, to colonize in the name of the UEG and preserve the human race." - Galactic Narrator''

Species
''"The installation was specifically built to study and contain the Flood. Their survival as a race was dependent upon it. I am grateful to see that some of them survived to reproduce." - 343 Guilty Spark''

Species are unique lifeforms. They are generally divided into three classifications based on their level of sentience: sentient, semi-sentient, and non-sentient. There are nineteen Sentiet species in the Milky Way, not including sub-species. There are over twenty two non-species not including Earth's many species. Sentient species are sometimes erroneously referred to as races, which should be more accurately referred to groups or subspecies within a species.