I looked on bionicle.com and it said that " the silver subspecies of the skull spiders is the fastest.They strike with a lighting speed that mask even Gali impressed.The blue skull spiders are some tough critters. They have been known to survive incredible things. Such as a falling Onua. The green skull spiders have developed x-ray vision, which enables them to find prey even in total darkness. A fact that that gives Lewa the crepes.he silver subspecies of the skull spiders is the fastest. They strike with a lightning speed that makes even Gali impressed. it included a visorak like poster. discusss http://www.lego.com/en-us/bionicle/characters/green-skull-spider-6a395548718c41079ec35a25287da752 here is the link.