What Do Hummingbirds Eat? Nectar, Insects, and the Truth About Their Diet

The Energy Half: Nectar and Sugar

Nectar is almost pure energy, and a hummingbird needs an enormous amount of it. Research from UC Berkeley puts daily consumption at between half and one and a half times the bird’s own body weight in nectar, gathered across hundreds of flower visits. In energy terms, a wild Anna’s Hummingbird requires the equivalent of about two grams of sucrose a day, which is close to half its own weight in pure sugar.

That fuel is burned almost as fast as it arrives. A hummingbird can draw on sugar it swallowed only minutes earlier to power the very flight muscles that carried it to the flower, one of the fastest fuel-to-motion turnarounds in the animal world. Its blood sugar runs at levels that would be dangerous in a person, and its body is built to handle that load without harm.

Hummingbirds are also choosy about concentration, though not in the way feeder lore suggests. Across a survey of 202 hummingbird-pollinated plants, nectar averaged around 25 percent sugar, with a range from 7 to 67 percent. That is the range the standard feeder recipe lands in, one part white sugar to four parts water, which is why it works so well. Offered a free choice in the laboratory, though, hummingbirds take solutions considerably stronger than their own flowers provide.

They can afford to, because their tongue is an elastic pump rather than a capillary tube. Thick nectar costs a pump far less than it costs a tube. That recipe, and how to keep a feeder safe, is covered in our article on making nectar and caring for feeders. That recipe, and how to keep a feeder safe, is covered in our article on making nectar and caring for feeders.

The Protein Half: Insects and Spiders

Here is the part most people miss. Floral nectar is a poor source of nitrogen and has essentially no protein, and a bird cannot build muscle, grow feathers, or raise chicks on sugar. For that, hummingbirds hunt. Small insects and spiders supply the protein, amino acids, and fats their bodies cannot get from flowers.

In a detailed Costa Rican field study, Gary Stiles found that roughly half of all foraging efforts he recorded were arthropod hunting rather than nectaring, making nectaring the less frequent activity of the two. Working in Mexico, Helmuth Wagner concluded that a given species may feed mainly on nectar or mainly on insects depending on the time of year, and that most Mexican hummingbirds are not dependent on flowers. Some tropical species feed almost exclusively on spiders.

One caveat on those numbers: foraging effort is not the same thing as diet measured by mass or calories, and very few studies have measured the latter directly in wild hummingbirds. What the evidence does establish is the direction. Arthropods are not a supplement to a nectar diet. For many species, in many seasons, they are at least half of their foraging activity, and in some seasons the majority of it.

Their hunting is genuinely impressive to watch once you know to look for it. Hummingbirds catch gnats, fruit flies, aphids, whiteflies, small beetles, and mosquitoes by several methods:

• Hawking: darting out to snatch insects from midair.
• Gleaning: picking them off leaves, bark, and flowers.
• Probing: collecting the tiny insects tucked inside a flower at the same moment they sip its nectar.
• Web-robbing: plucking trapped insects, and sometimes the small spiders themselves, straight out of spider webs, often carrying off the silk for nest-building at the same time.

Protein matters most during breeding season, when females need it for egg production and growing nestlings, so a yard rich in small insects is as valuable to a nesting hummingbird as any flower. This is also why pesticides work against you even when your feeder is full: wiping out the insect population removes a food source the birds depend on. We cover that trade-off in the article on attracting hummingbirds to your garden, and the wider damage in the threats hummingbirds face.

The Overlooked Course: Tree Sap

When flowers are scarce, hummingbirds turn to an unexpected substitute: tree sap. Sapsuckers, a type of woodpecker, drill neat rows of small holes in tree trunks, and the sap that wells up is remarkably close to flower nectar in sugar content. Hummingbirds follow sapsuckers to these wells and drink from them, a habit that becomes vital in early spring, when migrants often arrive on their breeding grounds before the first flowers have opened. The Ruby-throated Hummingbird’s northward migration is closely tied to the Yellow-bellied Sapsucker for exactly this reason.

The wells offer a bonus, too. The sweet sap draws small insects, so a hummingbird visiting a sapsucker’s tree can top up on both sugar and protein in one stop. It is a neat piece of natural timing, and a reminder that a hummingbird’s food supply is woven through the whole landscape, not just the flowerbed.

The Accidental Ingredient: Alcohol

Nectar is sugar water sitting in the open air, and wherever there is sugar there are yeasts. The consequence is one that nobody thought to measure until recently: hummingbird food contains alcohol.

In 2026, researchers at UC Berkeley published the first large survey of ethanol in floral nectar, sampling 29 flowering plant species. They found it in 26 of them, at low concentrations averaging around 0.016 percent. Given how much nectar a hummingbird drinks in a day, that adds up to a small but genuinely chronic daily dose.

An earlier experiment from the same group tested whether the birds mind. Anna’s Hummingbirds were offered paired sugar solutions containing zero, one, or two percent ethanol, and the volume each bird drank was measured over three-hour trials. They showed no preference at all between zero and one percent, but drank significantly less of the two percent solution. So there appears to be a tolerance threshold: a little alcohol is simply part of the diet, and above roughly one percent they start turning it down.

There is a practical lesson in this for anyone with a feeder. The same study measured ethanol in ordinary hummingbird feeders in the field and found it peaking around 0.05 percent, roughly three times the level in fresh flower nectar. Fermentation in a feeder is not only a route to fungal disease, it also makes the nectar progressively less appealing. A feeder that has gone unchanged for a week in warm weather may be losing visitors before it ever looks cloudy.

A Few Minerals, and What They Don’t Eat

Hummingbirds need trace minerals as well, which they get mostly from their insect prey and nectar, and occasionally by sampling mineral-rich sand, ash, or sap. It is a minor part of the diet but a real one.

Worth clearing up: hummingbirds do not eat fruit the way robins or waxwings do. Their digestive systems are built for liquid, not solid food. A hummingbird may probe soft, overripe fruit for its juice, but this is an occasional opportunity rather than a staple.

How the Diet Shifts Through the Year

Because a hummingbird lives so close to its energy limit, its diet flexes with the seasons and its needs. In early spring, arriving migrants lean on sap and early insects until flowers catch up. Through the breeding season, insect protein takes on outsized importance for females raising young. Before migration, hummingbirds enter a phase of intense feeding called hyperphagia, packing on fat to fuel journeys that can cross the Gulf of Mexico nonstop. That fat-loading is part of the larger story told in our migration article.

And at the end of every day, the arithmetic runs out entirely. A hummingbird cannot eat overnight, which is why it resorts to torpor, shutting its metabolism down until dawn rather than trying to fuel it through the dark.

Frequently Asked Questions

Do hummingbirds eat anything besides nectar?

Yes, and they must. Nectar provides energy but no protein, so hummingbirds also eat large numbers of small insects and spiders, which supply the protein, amino acids, and fats that nectar lacks.

How much does a hummingbird eat in a day?

Between half and one and a half times its body weight in nectar, plus a significant amount of insect prey. In energy terms, a wild Anna’s needs about two grams of sugar daily, close to half its own weight. It feeds many times an hour while active.

What sugar concentration do hummingbirds prefer?

About 20 to 25 percent, which matches many natural flowers and is why the one-part-sugar to four-parts-water feeder recipe suits them.

Do hummingbirds eat fruit?

Not really. Their systems are built for liquids. They may sip the juice of soft overripe fruit occasionally, but fruit is not a regular food.

Why do insects matter so much for hummingbirds?

Insects are the birds’ only meaningful protein source, which is essential for muscle, feathers, and especially for raising chicks. A yard treated with broad pesticides starves them of it.

Is there really alcohol in hummingbird nectar?

Yes, at very low levels. A 2026 survey found ethanol in 26 of 29 flowering plant species, averaging about 0.016 percent. Hummingbirds are indifferent to alcohol below about one percent and avoid nectar above two percent, so a normal daily dose is simply part of their diet.

Does nectar in my feeder ferment?

It does, and faster in warm weather. Ethanol has been measured in field feeders at around 0.05 percent, several times the level in fresh flower nectar. Beyond the disease risk, fermenting nectar becomes less attractive to the birds, so changing it on schedule keeps visitors as well as keeping them healthy.

Conclusion

A hummingbird is not the delicate nectar-sipper it appears to be. It is a high-performance hunter and a resourceful opportunist, balancing sugar for fuel, insects for protein, and sap for the lean stretches between blooms. Feed that whole picture rather than just the sweet half, with a clean feeder and a yard full of both flowers and insect life, and you are supporting the bird as it actually lives.