The Na'vi are very large and have a crazy biology, complete with super bones and massive add-ons to the brain to do their networking trick. All of these are crazy expensive in terms of calorie consumption and nutrients and therefore require a lot of food (and quite possibly some trace amounts of unobtanium, not unlike how humans require trace amounts of many minerals). Fortunately, Pandora is full of giant trees and megafauna with the same kind of enhanced biologies that they can eat. Earth is not.
The Na'vi would be a minor extinction event for the nearby animals and the humans relying on them, and quite possibly still end up malnourished because animals with normal biologies just don't give them the same bang for their buck nutritionally.
The Na'vi would be a minor extinction event for the nearby animals and the humans relying on them, and quite possibly still end up malnourished because animals with normal biologies just don't give them the same bang for their buck nutritionally.
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