By Emma Mackenzie Making this simple tweak to your bird feeder can get rid of the risk of rats. Adding a bird feeder to your garden means you’ll likely share your green space with many of our feathered friends – but you also risk inviting some less-than-welcome guests if you aren’t careful. Rodents like rats and squirrels, unfortunately, can’t discern that the food you have left out for robins or tits isn’t actually there for them, and will quickly start chowing down on whatever you have left on your bird feeder. Pretty much no one is keen to invite a nest of rats into their outdoor space, so …