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Hummingbird Health: Appreciating the Little Things

By Kat Kerlin on April 21, 2015 in Human & Animal Health

UC Davis Protecting Hummingbird Health

Manfred Kusch’s garden is loud, in an idyllic sort of way. Birds tweet and flit, bees buzz, and the air hums with the wings of one of America’s most beloved creatures: the hummingbird.

For the past six years, Kusch, a UC Davis senior lecturer emeritus of French and comparative literature, has been opening his garden to the UC Davis Hummingbird Health and Conservation Program. The group, including the University of Wyoming, is the only collaborative program in the nation focused on hummingbird health and genetics.

“For any animal species, if you care about them, you need to do preventative health,” said Lisa Tell, director of the Hummingbird Health and Conservation program and an avian disease veterinarian in the School of Veterinary Medicine. “You have to establish what’s normal so when you have a problem, you know it’s not normal.”

Flowers: hummingbird magnets

While the program’s volunteers, staff and faculty come to trap, band and release hummingbirds — sometimes 50 in a morning — the hummingbirds come for the flowers. Salvia, California fuschia, bladderpod, aloe and others important to hummingbird health dot the garden in bright bursts of color. Most of these flowering plants were bought over the past 30 years from UC Davis Arboretum plant sales and planted specifically to attract pollinators like bees and hummingbirds.

“I probably transplanted about half of the arboretum here,” joked Kusch, whose property abutting Putah Creek in Winters was mostly dirt and weeds when he arrived.

Band of birders

At a table overlooking the garden, Tell, a federally permitted master bander, and student volunteers Emilie Graves, Shannon Skalos and Nicole Mikoni delicately give a health checkup for each hummingbird that they catch in a specialized trap.

After softly wrapping the bird in a small mesh bag, they assess the age of the hummingbird, count the iridescent feathers on its throat, measure its bill and wing length, and check for feather molt and tail mites. Then, with the steady hands of a surgeon, Tell attaches an aluminum band the size of a basmati rice grain around the leg of any new captures.

Checkup complete, they feed and then place the hummingbird in the palm of their hand, where it vibrates softly until the bird realizes it is free and—in a blink—launches off into the trees.

Anna's hummingbird approaching a flower.
The program discovered and diagnosed a viral disease, avian pox, in Anna’s hummingbirds. Lynda Goff/photo

The birds and the bees

While bees get most of the pollinator glory, hummingbirds are also important pollinators. More than 160 native North American plants depend exclusively on hummingbirds for pollination. A sentinel species, hummingbirds can indicate overall environmental health.

They are threatened by habitat loss, climate change and human development. Yet, amid these threats and despite their importance, little is known about their health and genetics.

For instance, when colony collapse disorder threatened the existence of bees, it was important to know what was normal for bee health so that scientists could recognize when something was wrong.

Lisa Tell reaching in a netted cage for a hummingbird.
Program Director Lisa Tell reaches into a trap to gently catch a hummingbird from the netting. She will then give the bird a health checkup, band and release it.  (Don Preisler/UC Davis School of Veterinary Medicine photo)

Hummingbird research

Professor Emeritus Holly Ernest founded the Hummingbird Health and Conservation Program while she was a wildlife geneticist at UC Davis. Ernest now continues hummingbird genetic work as a professor at the University of Wyoming, where she moved last year. She and the new UC Davis director, Tell, work closely together to investigate hummingbird health.

The program discovered and diagnosed a viral disease, avian pox, in Anna’s hummingbirds. It’s currently researching the prevalence of blood parasites in California’s hummingbirds and how climate change can impact hummingbirds’ susceptibility to malaria and West Nile virus. A newly launched study is examining hummingbird exposure to heavy metals and pesticides. The program is also investigating the prevalence of tail mites in the birds.

“Before people see large numbers of declines in hummingbird populations, we want to figure out what we can do from a prevention aspect,” Tell said.  

 

Three women sit at a table with books and other paraphernalia
From left:  UC Davis undergraduate student Paige Smith, citizen-scientist volunteer Karen VanVorhis and Lisa Tell delicately give a health checkup for each hummingbird that they catch. (Don Preisler/UC Davis School of Veterinary Medicine photo)

The magic of hummingbirds

Kusch vividly remembers the first time he saw a hummingbird. When he was a 6-year-old boy in post-war Germany, a man arrived at his one-room schoolhouse and, in exchange for food, showed his class some magic tricks.

For one of his presentations, the man opened a little box. Inside it was a tiny preserved bird, a hummingbird.

“I thought maybe he was tricking us — a bird this small,” Kusch said.

Years later, as a doctoral student at UC Berkeley, he saw a live hummingbird in a tree, and soon learned the tiny birds were native only to the Americas, and that California was full of them.

Hummingbird facts

Rufous hummingbird
Hummingbirds can travel 600 miles at 25 miles per hour, some journeying 3,000 miles a year. (Lynda Goff/photo)

These tiny flyers have other distinguishing traits:

  • The smallest birds in the world, hummingbirds weigh as little as 2.5 grams, the weight of a penny.
  • They can fly forward, backward and hover.
  • They can travel 600 miles at 25 miles per hour, some journeying 3,000 miles a year.
  • They’re fast little guys, capable of flying in bursts up to 60 miles per hour while their wings beat 80 times per second.

“I think they’re amazing birds because they’re small, they’re super athletic,” Tell said. “They’re actually really tough little birds. For their size, I think they’re really smart. And they’re beautiful. I really believe they’re gifts of nature. They’re everything packed into a little bird.”

Ambassadors for conservation

To get people to pay attention to protecting the world around them, it helps to have an enchanting creature on hand.

“Even if you’re not into ornithology, who doesn’t like hummingbirds?” said Graves, who is entering the Graduate Group in Ecology in the  UC Davis College of Agriculture and Environmental Sciences. “They’re a good ambassador species for conservation.”

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