I am most concerned having just read about the fat balls so many of us hang up for our garden birds. It was said that many of these are low in fat, and include fillers like sand, sawdust, and even glue. Oh dear, I am shocked and upset. How can we be expected to know such things? I guess there are many makes. and indeed shops selling bird food. No doubt a paying game, as so many of us are keen to do our best for our lovely garden birds at this time of year. What can we do?