Jarvis was part of the Cavehill Herd. Cavehill Country Park asked the sanctuary to remove 14 feral horses from the park. This was a major challenge because of their wild nature and the difficult terrain. The horses couldn't remain on the hills because of the danger to the public and the lack of food in winter, so volunteers came up every day during the winter to provide feed and get the animals used to them. Of the 14 horses, seven of the mares were pregnant, although two later miscarried as they were too young to carry a foal to term. If the herd hadn't been removed, there could potentially have been more than 20 horses by the end of the year and double that next summer. He was part of the first group of 5 lifted from the mountain.