[Avodah] Chitzonios and Tereifos

[Michael Poppers via Avodah]

R'Micha responded to me:
>> Isn't this yet another example in *halachah* of working only with what
>> can be seen?

> How is the surface of a lung or brain more visible than the innards?
> The only difference is how much cutting is required.

And with insects in water, the only difference is whether external
magnification is required -- the *tzad hashaveh* would be whether an
external tool is required in order to 'see' something.