This can be done in the premium version. I have separate tick boxes for my lists that include heard only and heard only seen other. I can then run a report that will tell me which birds have only ever been heard or can toggle settings on and off to allow lists showing with and without heard only.
This can be done in the premium version. I have separate tick boxes for my lists that include heard only and heard only seen other. I can then run a report that will tell me which birds have only ever been heard or can toggle settings on and off to allow lists showing with and without heard only.