Cicadasarecool01's real username is CME6, he has a habit of copying someone else's username whenever he releases a video which he only keeps up for 24 hours. Funny that he started copying other people's usernames when he got angry that people were reposting his videos on other sites. I don't recall him releasing a new motion, just a new video using one of CicadasAreCool's freely distributed motions and it seems like someone uploaded on rule34video already here
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I actually haven't seen many people reusing TitaniumCactus and CicadasAreCool's motions.
KiruNeru is the only one artist that comes to mind who reuses free motions shared by other creators.
I don't know of an easy way to search for creators who reuse other people's motions. It's especially annoying cause some of these guys delete their videos for one reason or another from time to time.
If insect stuff is what you're looking for, you might have better luck by using keywords like "insect" , "insects", "虫" , "昆虫" or "蟲" in Oreno3D's search function.
Also the search function on Iwara has been buggy(heh) for almost 2 years now so chances are you won't find much no matter what keywords you put it. It won't even show me anything beyond the first page. Iwara itself is giving me error these days whenever I try to access it. I'm guessing it's because they're preparing to release the new version of the site.