bbc news, bringing you different stories from across the uk. cows controlled by the callers around their necks. controlled by the callers around their necks- controlled by the callers around their necks. ., , ., ., their necks. you can see we have a solar panel their necks. you can see we have a solar panel which their necks. you can see we have a solar panel which charges - their necks. you can see we have a solar panel which charges the i solar panel which charges the battery, nice and lightweight, flexible so cows are plenty of room to move around then a gps locator is on the top there so we can see exactly where the cows are at any one time which links to the virtual fence which is behind us or wherever you wanted to be really. the fence which is behind us or wherever you wanted to be really. you wanted to be really. the callers mean the national you wanted to be really. the callers mean the national trust you wanted to be really. the callers mean the national trust map i