Hummingbird Nutrient Requirements

These relatively small birds have extremely fast metabolisms. They lose heat quickly because of their small size and their rapid wing beats. Heat loss and exertion burn calories. In the fall, calorie needs of migratory hummingbirds increase. For example, the rufous hummingbird flies from breeding areas in Alaska through northern California to winter in central Mexico. Gaining weight before migration gives the birds enough fuel to survive the flight. Hummingbirds adjust the size of their territories based on the amount of food available, and they conserve energy by perching when they don't need to defend their territory or feed.

Hummingbirds specialize in pollinating nectar-producing flowers. Red flowers with deep throats tend to attract hummingbirds. Bright pink, purple, blue, orange and yellow flowers attract them, too, such as trumpet vine and petunias. When they feed on a flower, they pick up pollen and deliver it to other flowers, helping the plant reproduce. They prefer nectar rich in sucrose to those containing glucose or fructose, the other sugars common in flower nectar, the Smithsonian National Zoological Park reports. The common hummingbird feeder recipe of one cup of table sugar to four cups of water provides hummingbirds with the right concentration of sucrose.

Although feeding on nectar gives hummingbirds energy for their rapid flight and hovering, they need protein, too. Pollen from the flowers they feed on provides some of their protein. Insects and spiders serve as their main protein sources. The birds will eat spiders and insects caught in a spider's web. They also pluck insects out of the air or off plants. Mother hummingbirds feed insects to their young because the growing birds need a diet high in protein.

Don't add food coloring or commercial hummingbird food made with dye to hummingbird food because it may harm the birds, the Cornell Lab of Ornithology advises. Honey isn't suitable for hummingbird food, because bacteria and fungus thrive in honey diluted with water. The best places for hummingbird feeders are shady spots out of reach of cats. Sunlight can cause sugar-water to ferment and spoil. If possible, supply hummingbirds with native plants such as bee balm, hummingbird sage and trumpet honeysuckle. The native versions have more nectar than hybrids, according to Audubon. Flower nectar supplies micro-nutrients. If you don't have space for a hummingbird garden, many hummingbird-attracting plants grow well in window boxes or containers.