A hummingbird in Long Island, New York. Bruce Bennett/Getty Images
by Benji Jones | Updated Jun 10, 2025, 11:35 AM PDT
Hummingbirds run on sugar.
Sweet nectar powers their tiny, furious bodies and super-fast wings, which beat as many as 80 to 90 times per second. And luckily for them, they don’t seem to get diabetes, even though they have extremely high blood glucose levels.
In the wild, hummingbirds, the smallest birds in the world, get their sugar from wildflowers, such as honeysuckle, lilies, and bee balm. But following the sweeping destruction of native prairies, forests, and wetlands over the last century, these fluttering jewels have had a more difficult time finding their glucose fix. Warming linked to climate change is also making flowers bloom earlier and changing the range of some hummingbird species, making it even harder for the birds to feed.
While humans are, of course, responsible for these impacts, some wildlife lovers are also trying to help — by installing feeders. Often red and plastic and filled with sugar water, hummingbird feeders provide a supplementary source of nectar for hummingbirds, especially during fall and spring migration when the birds are traveling long distances. Research shows that feeders may increase the number of hummingbirds locally, and birds tend to visit them more when there are fewer flowers in bloom.
So on the whole, feeders are good. They also provide an easy way for people to connect with wildlife.
But there’s one big, big, caveat here: If your feeder is dirty, it could be harming, or even killing, the hummers that visit it, turning the feeder from a lifeline into a trap. Unless you’re prepared to regularly clean your feeder, you may be better off not having one.