First, I am jealous of all the trees. You have great habitat for the birds and shouldn’t have to worry about furry creatures. One of the best performing products we have gotten in lately is Flaming Squirrel from Cole’s. Nothing is 100% effective for everybody, but this product has received extremely high reviews from our customers. It is a habenero oil that you mix in with your seed. Birds are not affected but most mammals can’t take the heat.