The Giant Hummingbird of Western South America Is Actually Two Species

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The Giant Hummingbird of Western South America Is Actually Two Species | Lab ManagerLab Manager | Run Your Lab Like a BusinessHomeTopicsScienceBiology Register for free to listen to this article The giant hummingbird of western South America is not one species but two, an international group of researchers has found.

The northern population stays in the high Andes year-round while the southern population migrates from sea level up to 14,000 feet for the nonbreeding months. The two species appear identical. But looks deceive – their genomes and behaviors tell a different story, according to the study published May 13 in Proceedings of the National Academy of Sciences.

“These are amazing birds,” said lead author Jessie Williamson, a National Science Foundation Postdoctoral Fellow and Rose Postdoctoral Fellow at the Cornell Lab of Ornithology. “They’re about eight times the size of a ruby-throated hummingbird. We knew that some giant hummingbirds migrated, but until we sequenced genomes from the two populations, we had never realized just how different they are.”

“They are as different from each other as chimpanzees are from bonobos,” said senior author Chris Witt, of the University of New Mexico. “The two species do overlap on their high elevation wintering grounds. It’s mind-boggling that until now nobody figured out the giant hummingbird mystery, yet these two species have been separate for millions of years.”

At first, the research goal was simply to learn where the migratory population went – a journey tracked with geolocators and satellite transmitters. The researchers tracked eight individual hummingbirds migrating up to 5,200 miles from the Chilean coast up to the Andes of Peru and back – one of the longest, if not the longest hummingbird migration in the world. The out-and-back journey is farther than the distance from New York City to Istanbul, Turkey.

The authors say the shift in migratory behavior is what drove speciation, though there’s no way to tell whether migratory behavior was gained by one species or lost by the other. Until now, there had been only one known species on this branch of the hummingbird family tree, while the giant hummingbird’s closest relatives – the world’s smallest hummingbirds – diversified into 165 distinct hummingbird species.

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The researchers are proposing straightforward common names: northern giant hummingbird and southern giant hummingbird. The southern migrant species will retain the Latin name, Patagona gigas. The proposed scientific name for the resident northern population is Patagona chaski. “Chaski” is the word for messenger in Quechua, a family of Indigenous languages that spread from Peru to other neighboring countries.

The researchers relied on support and local knowledge from landowners and villages in Peru and Chile. Co-author Emil Bautista’s village in Peru was a home base for this project and the community supported the scientists’ work. But Bautista – who has more than 15 years of field experience – said this fieldwork was the hardest he’s ever done.

“Capturing giant hummingbirds is very challenging,” he said. “They watch everything and they know their territories well. We had to be strategic in choosing sites for our nets. If giant hummingbirds see something unusual, they won’t visit that spot. They are more observant than other birds.”

Right now, giant hummingbird populations, north and south, are stable and the species are common within their ranges – some even visit backyard nectar feeders. The team plans to continue research on these enigmatic birds.

“We have to figure out where these two forms come together and how they interact,” Witt said. “Do they compete, is one dominant over the other, how might they partition resources, and do they mix or spatially segregate within the winter range? Lots of interesting questions to pursue.”

“I’m really interested in how southern giant hummingbirds make such dramatic shifts in elevation during migration. They travel from sea level to the high Andes in just a few weeks,” said Williamson. “They’re like miniature mountain climbers. How do they change their physiology to facilitate these movements?”

-Note: This news release was originally published on the Cornell University website. As it has been republished, it may deviate from our style guide.

Tags: BiologybirdsGenomeMigrationnew species The researchers are proposing straightforward common names: northern giant hummingbird and southern giant hummingbird. The southern migrant species will retain the Latin name, Patagona gigas. The proposed scientific name for the resident northern population is Patagona chaski. “Chaski” is the word for messenger in Quechua, a family of Indigenous languages that spread from Peru to other neighboring countries.

The researchers relied on support and local knowledge from landowners and villages in Peru and Chile. Co-author Emil Bautista’s village in Peru was a home base for this project and the community supported the scientists’ work. But Bautista – who has more than 15 years of field experience – said this fieldwork was the hardest he’s ever done.

“Capturing giant hummingbirds is very challenging,” he said. “They watch everything and they know their territories well. We had to be strategic in choosing sites for our nets. If giant hummingbirds see something unusual, they won’t visit that spot. They are more observant than other birds.”

Right now, giant hummingbird populations, north and south, are stable and the species are common within their ranges – some even visit backyard nectar feeders. The team plans to continue research on these enigmatic birds.

“We have to figure out where these two forms come together and how they interact,” Witt said. “Do they compete, is one dominant over the other, how might they partition resources, and do they mix or spatially segregate within the winter range? Lots of interesting questions to pursue.”

“I’m really interested in how southern giant hummingbirds make such dramatic shifts in elevation during migration. They travel from sea level to the high Andes in just a few weeks,” said Williamson. “They’re like miniature mountain climbers. How do they change their physiology to facilitate these movements?”

-Note: This news release was originally published on the Cornell University website. As it has been republished, it may deviate from our style guide.

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