Food coloring is also not needed because a little red color on the feeder itself is usually enough to attract the birds. Clean feeders every 5-7 days in order to prevent the growth of harmful bacteria. Throw away the old solution and rinse the feeder well with hot water. Do not use soap or detergent. The feeder can be cleaned by using a vinegar solution and some uncooked rice grains and shaking vigorously.
Hummers also eat flower nectar and high-protein insects.