People are being warned not to try and take selfies with deer in Dublin's Phoenix Park.
The annual rut begins in the coming weeks and the DSPCA says approaching them could risk injury.
Bucks will soon do battle for the right to mate - locking antlers with their rivals.
Visitors to the park can often be seen holding out food to deer to get the perfect picture.
They've become Instagram stars in recent years, with people holding out food to get the nicest shot.
Gillian Bird from the DSPCA says it's one of nature's most spectacular displays.
But she says people should make sure they're absolutely nowhere near when it happens.