That probably wasn't the best way to put it. I'm always making up names for things that sound silly used in general conversation.
Each type of bird - show, game, production - has a group of skills that are especially high for them. These are the skills that gain them points in specific contests (beauty, boxing). You ideally want the other "non-special" skills to be low, so you can get the maximum out of the relevant skills and still keep your bird's skill total under the category skill cap. Except in this older version there don't appear to be categories for contests, so I suppose my entire argument has just been rendered pretty useless. ;P