A different conception may be present in a yet later essay on the origin of the Ents which, according to Christopher Tolkien, is likely to derive from 1963 and was included into the published "Silmarillion". Contemporary J. R. R. Tolkien's notes define the Ents as "either souls sent to inhabit trees, or else that slowly took to the likeness of trees"; the essay agrees in this, adding that the Ents appeared shortly after the Awakening of the Elves, when "the thought of Yavanna ... spirits from afar". The same origin for the Great Eagles may be implied by the speech of Manwë within the essay: "... before the Children awake there shall go forth with wings like the wind the Eagles of the Lords of the West. ... In the mountains the Eagles shall house, and hear the voices of those who call upon [the Valar."