Corrected entry: Neytiri's mother, Mo'at, has three arms. As Neytiri runs towards Mo'at, Mo'at holds out her arms to hold her. She puts one around her waist, the other around her arm. But then her arm splits so that she now has two arms on her daughter's left arm, one arm on her daughter's waist.
LittleMonkey92
27th May 2011
Correction: This is not so. Mo'at only has two arms. In that scene (when Jake comes back on Last Shadow) it is Neytiri's own arm across her middle, not Mo'at's.