This is my idea: Chasing lions away.
As we all know. In unsorted den we can move lions from den to den. Right. Now, if we want to chase them away, we have to go into their page to do so.

Suggestion:
Make all of the secondary options:
Chase Lion Away/Kill Lion/Send Lion To Nature Reserve/Abandon Cub. As a drop down option (Only) on Unsorted Den.
*This way we decrease the number of lion we dont want.
*Place all wanted lions in a different den /or secure them. This way we dont chase them away by accident.