Successfully calling deer is based on the deer’s natural curiosity about other deer in its immediate area. However, deer are more curious at some times than at others.
Does with fawns, particularly in groups, are in their mothering mode and will often respond quickly to a fawn’s distress bleat. Often it will be the dominant doe of the group that will rush right over to investigate.
During pre-rut, bucks are becoming hostile and territorial. During that period, they are prone to investigate the grunt of a strange buck. During the rut, a buck tending a doe is hard to pull off the scent, but a strong challenging grunt might make him want to protect both his territory and the doe.
Bucks that aren’t with does are vulnerable to doe bleats during the rut. During the post-rut, the bucks are once again highly competitive over any still-receptive does. Buck grunts and doe bleats continue to be very effective.