Perhaps the animals had two antenna due to the need to be balanced and symmetrical. This would not be so much of an issue for the Na`vi. Also, the animals may have need of two for their own uses, mating, bonding, connecting to their world.
I bet those two stuck their braids together when they got..friendly. I expected them to show that, but if they did I missed it. But it makes perfect sense to me.
As for the leg issue, well lots of animals on our earth have a different number of legs than we do. Perhaps more variety could have been shown in that certain case, but I thought it was grand the things they showed despite that.
Anyways, just my thoughts on that.
Saw it tonight, loved it. A bit predictable, but that's okay. The graphics were amazing, the 3D was beautiful. A visually appealing story all around, and a pretty good plot.
Enjoyed it highly!









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