Ants and other insects are also attracted to hummingbird nectar. See the article on hummingbirds for more details. Yeasts tend to grow in hummingbird feeders and spoil the solution, so they must be refreshed frequently and kept very clean to avoid harm to the birds. The sugar mixture is sometimes colored with red food coloring to attract birds, though this is not necessary if the feeder itself is red, and may actually be harmful to the birds. Hummingbird feeders usually have red accents or red glass to help attract hummingbirds.
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