Ork Smell

Throughout an Orkoid's life it sheds spore-like cells containing the entire genetic code of the Orkoid races. These are shed in an unconscious manner much as a human replicates skin cells and sheds the dead tissue them without realising it. These spores are microscopic in nature and fulfil a number of functions. Firstly, they can be detected by the highly sensitive nasal organs of the Orkoids, conveying a variety of information such as status, age, and so on. It also enables an Orkoid to locate other Orkoids over quite a wide distance [several miles, given wind strength, direction, and so on].

- Codex: Orks, page 47