Does Isaiah 11:6-9 speak of the harmony we hope to see in Heaven? If yes, then will animals be found there?

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Isaiah 11:6-9 reads:

6 The wolf shall dwell with the lamb,
and the leopard shall lie down with the young goat, and the calf and the lion and the fattened calf together;
and a little child shall lead them.
7 The cow and the bear shall graze;
their young shall lie down together;
and the lion shall eat straw like the ox.
8 The nursing child shall play over the hole of the cobra,
and the weaned child shall put his hand on the adder’s den.
9 They shall not hurt or destroy
in all my holy mountain; for the earth shall be full of the knowledge of the Lord
as the waters cover the sea.

Is the scripture above alluding to Heaven as “God’s holy mountain”? Does it speak of the harmony we hope to see in Heaven? If yes, then will animals be found in Heaven?

In my views I believe animals will be in heaven. If they were present in the first world; why are they going to be exonerated in the world after?