I've been hunting for quite a while and have never encountered this situation. However,my question isregarding if it is ethical to kill a doe with young fawns?

At what age are the fawns able to take care of themselves i.e. find food etc..??? I have corn feeders and they have a huge acorn supply. For one, if they die after I shoot their mom I really killed 3 deer.

Sorry if this is a dumb question, but I want to do the right thing.