"The problem of fly-grazing - the problem of horses on common land - is an enormous problem" says the RSPCA's Gethin Russell-Jones.
"Our RSPCA inspectors are involved daily in recovering horses, dealing with complaints".
"There must be hundreds and hundreds of horses scattered across South Wales at the moment".
More top news
A shopper has received a community order after he admitted uploading an explicit image to an iPad at a Tesco supermarket in Swansea.
Wintry showers this morning, particularly in the west. Turning drier and brighter this afternoon but still some sleet or snow showers.
A special service is being held in Swansea city centre to remember a popular homeless man who died earlier this week.