Just watched Avatar on TV and the Na'vi's anatomy bugged me just as much as the first time. Every animal on Pandora has 4 eyes and 6 limbs, except the overgrown smurfs. Did we ever get an explanation for this? They must be indigenous because they have the ponytail link tendrils, but they must also have seperated dann early in the planets evolution from Most other evolutionary branches to not even have vestigial stumbs. Doesn't make much sense. Plus, having four arms seems like a big advantage on a planet where life happens on floating jungle rocks that would be climbed all the time.