Fueling Up
August 29, 2017 by Rita Welch

Hummingbirds double their weight as they prepare to fly hundreds of miles. What local nectar sources are they finding?

"They've been hitting the Nasturtiums hard. Slowing down on the feeders," wrote Patty Jennings, August 22nd from Stacyville, Maine.

Finding Fuel
Darting among flowers, hovering at feeders, and flying long distances, hummers are using a lot of energy. The tiny birds are big eaters. No animal on earth has a faster metabolism. They are burning energy so fast that they need to eat 1.5 to 3 times their weight in food each day.

Your backyard hummers will leave while nectar-rich flowers are still in bloom and feeders are full. Fewer hours of daylight trigger the hormonal changes that cause their urge to fuel up and fly south.

One hummer can visit as many as two hundred flowers in fifteen minutes. What natural nectar sources are available now — and which ones are fading?


What is still blooming?

Tom Chambers

Which flowers are fading?

Amy Evoniuk

Journal: Nectar and Migration

Why do hummingbirds begin fall migration when nectar-rich flowers are still available?

Report Your Sightings
Report your sightings now — and continue to report weekly as long as hummingbirds are present.

Report at least once per week while hummingbirds are present. With your help, our map will show where hummingbirds are present during the fall migration season.


Hummingbird fall sightings
Map | List

Next Update September 5, 2017