A species was a group of living organisms capable of interbreeding. The galaxy and its many planets were teeming with diverse species, with members of a species sharing a fixed set of observable biological characteristics. Some species were sentient, capable of intelligent thinking, while others were not, with more than twenty million sentient species in the galaxy.
Species whose body plan resembled that of humans were referred to as humanoid. Species included humans, near-humans and aliens. According to Lugubrious Mote, most sentient species in the galaxy were about the same size, ranging in height between about half a meter to three meters.
Classification of species included amphibians, birds, felines, insects, mammals, mollusks, reptiles, reptomammals, rodents, snakes and spiders.
Kindalo and drengir were plant based sentient species.
Wirutid were a fungus based sentient species.
Fish were Non-sentient.
Some species like the Zillo Beast, Purrgil and Mairan were Semi-sentient.
Reproduction was how species created new life.
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