Where are the Ents from?

<font face="Verdana"><table><TR><TD><FONT SIZE="1" face="Verdana, Helvetica, sans-serif">Registered User
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I haven't found sth. about that neither in the Silmarillion nor somewhere else? Did the just suddenly appeared as if they always existed as the dwarves or where do the come from?
And, have they ever found the wifes again? And, do they appear in the film, who knows?

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