I probably should keep some secrets to myself, but I do tend to use fawn distress more in the late winter and spring to help better trick the coyotes that have heard every Tom, Dick, and Harry blowing on a single cottontail distress reed or blasting Lightning Jack out of their FoxPro all winter long...
It tends to yield a slower response than smaller game distress, except for the occasional hard charging territorial dog that comes in after it at 100mph.