Current visitors to my garden has dropped off over the last month, From Great, Coal and Blue tit and the normal , I can only attract the whole population on Westhoughtons Collared Dove and Starling (22 Collared Dove in one sitting).Also now have a family of mice under the shed , Have washed and rinsed the feeders and moved them around the garden , even tried my own feeders with Lard and seed . Any suggestions ?