I nearly sh at myself last weekend I had just finished using the last of a bag of high fat feeding ,with the usual dust etc at the bottom , I cleaned out and put the waste into the bag rolled it over and jammed my shovel on top of the bag to stop attracting flys , I went in the following morn to clean out I scraped all sections into piles lifted my shovel and immediately felt my hand an wrist itchy , I rubbed it but the itch remained I went outside in the sunlight to have a better look , fk me my hand and nearly up to my elbow was moving with small mites , thousands of them , I grabbed a tin of insect killer and sprayed my arm , I was shittinmyself to tell the wife incase she said yer no getting back in the house , I then opened the bag and it was moving inside with them so I sprayed it as well and dumped the bag in bin and sprayed all round about where the bag was , fk me I can still feel them even as I write this , and I've noticed my birds leaving maize this year as well but looking for other seeds .last time I seen this was in a bag of peckets were a pellet feed years and years ago , so stopped using pellets for about 15/20 years