If you look at , then is by far the most common option. This is confirmed by the frequency data in the BCCWJ (Balanced Corpus of Contemporary Written Japanese, via <
676 results
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10 results
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0 results
is still a lot more popular than any version. (But that's to be expected since, like many other for animals, is not and readings are very rare.)
Of course, can also be written in . It's not easy to get numbers, but even looking at alone, we already get big numbers:
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1 result
Just something to keep in mind when choosing whether to write in or not.
* * *
_Edit._
The dictionary entry for is
> **** [1]
>
> [...]
The notation means that the _kanji_ is not and the angled brackets mean that the reading is . As such, writing as or or wouldn't be seen as incorrect, but unusual.