Driven from their home system by the geth nearly three centuries ago, most quarians now live aboard the Migrant Fleet, a flotilla of fifty thousand vessels ranging in size from passenger shuttles to mobile space stations.
Home to 17 million quarians, the flotilla understandably has scarce resources. Because of this, each quarian must go on a rite of passage known as the Pilgrimage when they come of age. They leave the fleet and only return once they have found something of value they can bring back to their people.
Other species tend to look down on the quarians for creating the geth and for the negative impact their fleet has when it enters a system. This has led to many myths and rumors about the quarians, including the belief that underneath their clothes and breathing masks, they are actually cybernetic creatures: a combination of organic and synthetic parts.