Anger in the Old Forest!

[Tuor in Gondolin]

This subject does bring up a related topic. Why would
ents and huorns seem to be only endemic to Eriador and Fangorn?
Coming from Beleriand it would seem to be no great feat for them
to get to Mirkwood via, say, the Ered Mithrain, not even having
thereby to contend with rivers such as the Greyflood. Or even
getting to the trollshaws, where they could make mincemeat
of even the likes of Tom or Bert!

[skip spence]

Originally Posted by Tuor in Gondolin

Why would
ents and huorns seem to be only endemic to Eriador and Fangorn?

Is this an assumtion or do you have any textual support for it? Because I see no reason to assume the Ents and Huorns were endemic to these places. Firstly, as can be understood from my previous post, I don't believe there were any Ents or Huorns in the Old Forest, at least not at the time Frodo and company passed through. Secondly, I find it easy to believe that there could have been remnants of the ancient forests in the eastern parts of ME as well as in the northwest, and that Ents and Huorns might be found there. After all, whatever happened to the Entwifes?