Species of the Core

The Species of the Core are the various life forms which evolved in the Core of the Galaxy of Life, where space is so dense, and celestial objects are so near one another, that it constitutes a single contiguous ecosystem.

Overview
From A Brief History of History, the first Source Book.

''Because of the intense density of matter in the Core, ecosystems are not limited to any one celestial body. In fact, most species evolve mechanisms to leap from planet to planet, and use gravitational slingshots to arrive where desired, happily suffering the consequences of relativity.''

''As a result, the genetic flow of organisms living in the Core is not limited to any one celestial body. The entire Core unto itself behaves as a single ecosystem. No organism here has evolved sentience, and none are capable of abstracting complex notions like “self” and “other”. However, many, if not most, have developed a level of sapience, which grants them a complex view of the universe, despite being fundamentally unable to see themselves as a part of that universe. This plays out in unique fashions depending on the particular species.''