People are being urged to practice "common sense" if they come into contact with deer over the coming weeks.
The breeding season for deer normally runs from October to mid-November and the deer typically lose their shyness to humans during this period.
Pat Skully, from the Wild Deer Association of Ireland, says this can lead to deer crossing roads and turning up in locations where they normally wouldn't.
It follows reports of stags approaching people in parts of north Monaghan, with a man injured in the area last year after he was attacked.
While Pat says it would be very unusual and unlikely for a deer to attack a human, he added that deer can act strangely this time of year.
He had this advice for people driving through areas where deer crossings are known to occur:
