Those lemur things they see at the beginning have fused upper arms, apparently. Yes, I, too, think that makes them look like a Skeletor minion.

So far, I'm passing off all zoological inconsistencies with the argument that the entire ecosystem (including the world-brain) is clearly the product of conscious alien design and tinkering. At least, I hope that's where the sequels go...

ETA: extemp, your Captcha codes are particularly surreal today. It seems to be asking me "who ninnies?" plaintively, to which I can only reply "Me, for needing to justify the ecology of a made-up world to myself"