〜 is one of (many) 〜
Structure
- Noun + は + Noun/Pronoun + の一つだ
Other than 一つ and 一人 which are given examples here could you use other counters such as 一匹 like so:
「猫は有名なペットの1匹です。」
“Cats are one of many popular pets.”
And so on with other counters relevant to subject or would you just stick with 一つ and 一人?
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Hey 
Other counters can be also used that way, though つ is the most common one.
この動物はネコ科の一種です。
This animal is one of the feline spieces.
Cheers,
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Please consider mentioning that in the notes for this. I tend to check every forum discussion thread as I learn new grammar in case I miss helpful things like this. 
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