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Since we get the information that they look at least more or less man-like in shape, I think they have not enough leafs left to them for a photosynthesis being their only energie source. Anyway, when I have my biologics right moving around does consume much more energie then just standing routed and develop a brench here and a fiew new leafs their. Which means photosynthesis can not such being as the Ents are.
Thus we are left with the Ent-drought. It seems that it has to be a high potential feeding, since the Ents did not drink it too often.
If I may speculate farther I would say that the inner mechanisems were more tree-like. Thus the drought didn't need any farther reformation it was direct nutriation for the cells. The transport mechanisem would be tree like, meaning capilar forces in combination with vapourisation of water at the leafs and probably any other surface. Since in the legs much energie would be consumed the feet/roots would have to work both ways: taking up water for the rest of the body during times like Fangorn standing under his waterfall and feeding water to the ground while walking to enable the transport of the energie. By drinking the high potential Ent-drought was then brought to some kind of inner resevior from which it could be distributed at need.
We do not have any idea how the Ent-drought was produced, but I would think that plants, probably trees, were used by the Ents to produce it. (Like man herding catle to have milk or bees to have honey.)
What remains is the questions of movements. But their are plants that do such things. I just don't have any clou how they manage it. But the mechanisem is their, it only must be addapted to the needs of the Ents.
Respectfully
Findegil
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