Xenobiology

Xenobiology is the study of alien organisms, which became a government-paid job after the discovery of such organisms (albeit, non-sentient) during humanity's colonization of nearby systems.

The UNSC Engineering Corps, a government organization known for surveying newly-discovered planets, required xenobiologists for their surveys. Professor Ellen Anders is a well-known xenobiologist.

List of appearances

 * Halo: Ghosts of Onyx
 * Halo Wars: Genesis
 * Halo Wars
 * Halo: Reach
 * Dr. Halsey's personal journal