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The ears of a rabbit are larger than ( ) of a fox.

1 ones. 2 it. 3. those

I understand “those” come in the blank. How about “ones”? Why can’t “ones” come?

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ones on its own is not correct, but the ones would be OK, though perhaps rather informal- fine for spoken English, but less acceptable in written English.

This NGram graph shows that those is very much more common in written English. Judging by the author's names, most of the instances of the ones were written by non native English speakers.

Here is a typical example:

The cognitive capabilities of complex organisms have little to do with the ones of a single cell.- The Amazing Journey of Reason, Mario Alemi, 2019

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You would at least want "the ones of a fox". or "a fox's ones"

But while that may be correct grammar, only "those of a fox" is idiomatic.

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