Trait categories - The known trait categories are accent colour (AC), highlight colour (HC), base colour (BC), mouth (MO), pattern (PA), eye shape (ES), eye colour (EC), fur (FU), wild element (WE), and environment (EN). One category is called Purrstige (PU), since genes from this category are required to breed Kitties with Purrstige traits. There is additional apparent trait category where no Cattributes have yet been discovered. In the community, this trait category is currently called “secret” (SE), until an official name is revealed. The term “Cattribute categories” is used colloquially and essentially describes trait categories, though it would not really be used to describe “secret” or “unknown” since neither of those categories yet contain any Cattributes.