I don't think you can tell without looking even deeper inside. And not just gutting them.
At my club we had a gal that worked for the DMF up at the Salem MA project and in the past we have saved complete frames for them. There is a bone inside, I think it is part of the ear bone. By looking at that they can tell the sex and allot more.
It was interesting stuff. But no.....you can't tell by looking.
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