In The Wight Rider when Gandalf tells Aragorn and Co. about Treebeard, Aragorn is shocked that they really exist. Now, consider all the rangers that were on the borders of the shire around the time Hal saw his Tree-man. Could there have been an Ent, let alone Ents, be they male or female without a ranger having seen one? And anything a ranger had seen would have been reported to their leader.
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