You mention the term "ninja" and people will think of the Japanese ninja...masked men in black outfits using martial arts and weaponry that emphasize stealth and evasion for purposes of assassination or reconnaisance. Indeed, the Japanese word "ninja" is translated as "invisible person". In Chinese wuxia fiction, however, we also often see masked individuals in black outfits (sometimes, they're our heroes in stealth mode) carrying out assassination or reconnaissance missions. They don't use the Japanese ninja stars or katanas characteristic of Japanese ninja, but otherwise their costumes and modus operandi are more or less the same as their Japanese counterparts. Was there a tradition of Chinese ninja that existed concurrently with the Japanese one?