My first can be found in a TREE

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My first can be found in a TREE,
but not on the GROUND.
My second not PERMITTED,
but certainly ALLOWED.
My third is in GREY,
if it is spelled the English way.
My fourth is in PEA,
but not in NUT.
Fifth is in HOUSES,
also in HUTS.
Sixth always in DAY
but never NIGHT.
almost done NOW,
but not QUITE.
My last is in STICKY,
but not in BUN
My whole very large it weighs a ton.
Who am I ?

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ELEPHANT