Copying others

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The Film "Avatar" has just lots of six legged animals. It makes me wonder why there Navi are not six legged?

I've also been re-reading David Weber, where the birds, mammals (?) are Hexapods. They have Treecats that are 6 limbed and live in the trees.

How did the makers of "Avatar" copy David Weber's Heptapods and not be in trouble?

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