i love zim actually and i can tell you the talests are the leaders, the taller you the more respect you get, zim is tiny... theyre all about conquering planets, thats what theyre born to do, i have the dvds and when we're done moving i can find the episode where they show zim being created. thy arent born that much i know. they train theyre whole lives to be invaders. theyre green aliens, thats about what they are. theyre allergic to water, it burns them, same with meat and most human foods. but they like snacks... as for theyre ships, i dont know how to show them to you unless you want my aim, then i can send it. theyre really.... round and bubble like though i think... thats the best i can explain it anyway. if theyres anything else you wanna know, please ask and i shall tell