One thing I forgot to mention was never use honey and never use artificial sweeteners, and never hang the hummingbird feeders in direct sunlight.
If you feed wildbirds here is a easy recipe to make your own suet bars.
First grind the suet and then melt it in a fry pan or broiler. Have enough chunk suet to fill two cups. Slowly melt then add two cups of peanut butter and a dozen cups of cornmeal while the concoction is still hot. Stir well until blended and spoon mixture into empty tuna cans or cupcake forms.
You can also limit the amount of corn meal and add raisins and crushed dry dog food and dried insects, cracked corn and seeds, or cracked nuts to the mixture. Tack the cans to a tree or put suet cakes in disgarded net onion bags.