{"id":261198,"date":"2025-05-28T06:21:21","date_gmt":"2025-05-28T06:21:21","guid":{"rendered":"https:\/\/peraltafinancing.com\/aerospace\/californias-hummingbirds-have-changed-their-beaks-in-response-to-backyard-feeders-study-finds\/"},"modified":"2025-05-28T06:21:21","modified_gmt":"2025-05-28T06:21:21","slug":"californias-hummingbirds-have-changed-their-beaks-in-response-to-backyard-feeders-study-finds","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=261198","title":{"rendered":"California’s Hummingbirds Have Changed Their Beaks in Response to Backyard Feeders, Study Finds"},"content":{"rendered":"


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With plenty of artificial nectar available, Anna\u2019s hummingbirds have expanded their range northward and their beaks have tended to become longer and larger<\/h2>\n
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Sarah Kuta<\/a><\/p>\n

– Daily Correspondent<\/span><\/p>\n

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Anna’s hummingbirds seem to be thriving amid urbanization in California, even as other hummingbird species have declined due to human activity.
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Many bird enthusiasts like to hang bright red feeders filled with homemade sugar water to attract hummingbirds to their gardens. Now, new research suggests this common practice may be driving rapid evolutionary change in one species in California.<\/p>\n

The beaks of Anna\u2019s hummingbirds<\/a>\u00a0(Calypte anna<\/em>) have gotten longer and larger over just a few generations, thanks largely to the proliferation of hummingbird feeders after World War II, according to the study published last week in the journal Global Change Biology<\/em><\/a>. In addition, the growing popularity of hummingbird feeders has allowed the tiny birds to expand their range northward, from Southern California all the way up the coast to British Columbia.<\/p>\n

To understand how Anna\u2019s hummingbirds<\/a> have changed, scientists gathered and analyzed data from a variety of sources. They scoured California newspaper archives for hummingbird feeder advertisements between 1860 and 2020, as well as information about the spread of eucalyptus trees\u2014a year-round, non-native source of nectar.<\/p>\n

They also collected data from the Audubon Christmas Bird Count<\/a>, an annual citizen science survey that helped them map the species\u2019 range between 1938 and 2019. Data from the U.S. Census helped them plot human population density over the same period.<\/p>\n

Finally, the team measured the beaks of 400 Anna\u2019s hummingbirds in museum collections that span the years 1861 to 2020, to see how they had changed over time.<\/p>\n

\u201cWe did really cool shape analyses, we looked at all the shapes of beaks in two dimensions as well as three dimensions,\u201d says study lead author Nicolas Alexandre<\/a>, a geneticist now with Colossal Biosciences who conducted the research while at the University of California, Berkeley, to SFGate<\/em><\/a>\u2019s Kasia Pawlowska.<\/p>\n

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Bird enthusiasts often hang bright red feeders filled with homemade sugar water to attract various species of hummingbirds to their gardens.<\/p>\n

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Together, their analyses paint a picture of how human activities have shaped the Anna\u2019s hummingbird over time. First, the widespread planting of eucalyptus trees starting in the mid-1800s seems to have allowed the petite birds to begin expanding their range.<\/p>\n

But once hummingbird feeders took off, the birds really began to thrive. Their range continued to grow, and their bodies adapted to the artificial abundance of food. In areas where feeders were common, the hummingbirds\u2019\u00a0beaks got bigger\u2014which is the equivalent of \u201chaving a large spoon to eat with,\u201d says study co-author Alejandro Rico-Guevara<\/a>, an evolutionary biologist at the University of Washington, to Science<\/em><\/a>\u2019s Rachel Nuwer. Male birds in these areas also developed sharper, pointier beaks compared to females, a territorial adaptation that probably helped them fend off competing males.<\/p>\n

\u201cImagine you have a bunch of flowers, and the shape of the flower is going to constrain how efficiently you can feed from that flower. Now imagine you have this giant reservoir of nectar that\u2019s always available,\u201d says Alexandre to the Guardian<\/em><\/a>\u2019s Cy Neff. \u201cI want to get as much nectar with every drink before someone displaces me at the feeder. A longer beak with more volume is going to be advantageous.\u201d<\/p>\n

The beaks of birds living in colder regions, however, got smaller and shorter. This change likely helped these Anna\u2019s hummingbirds conserve heat, since their beaks help with thermoregulation, as the team showed with an infrared camera.<\/p>\n

California\u2019s Anna\u2019s hummingbirds adapted relatively quickly. Researchers saw changes over the course of just about ten generations. Though we often think of evolution as happening slowly, over hundreds of thousands or even millions of years, it can\u2014and often does\u2014occur \u201cliterally in front of our eyes,\u201d Rico-Guevara tells NPR<\/a>\u2019s Kat Lonsdorf.<\/p>\n

\u201cAnd we just need to pay attention to it,\u201d he adds.<\/p>\n

But while the Anna\u2019s hummingbird has successfully adapted to urbanization, other hummingbird species have \u201csharply declined\u201d alongside the same human influences, writes Elizabeth M. Steell<\/a>, an evolutionary biologist at the University of Cambridge in England who was not involved with the research, in a commentary<\/a> accompanying the study.<\/p>\n

Why is that? It\u2019s not entirely clear, but Steell suspects the Anna\u2019s hummingbird may have a \u201chigh propensity\u201d for evolving its physical features when faced with human-driven changes to its environment. Future research might be able to shed more light on what makes the Anna\u2019s hummingbird so flexible, she adds.<\/p>\n

Anna\u2019s hummingbirds are far from the first species to adapt to human-caused changes to their environment. In fact, Alexandre was initially inspired to conduct the study after learning about how seed feeders in the United Kingdom may have caused the beaks of great tits to grow longer<\/a> than their counterparts in the Netherlands.<\/p>\n

Ivory poaching in Mozambique led to a rise in tuskless elephants<\/a>, while peppered moths became darker<\/a> in response to air pollution during the Industrial Revolution. Pigeons<\/a> also adapted in response to human development, nesting on skyscrapers instead of on cliff faces and expanding their range alongside people.<\/p>\n

And these are just a few examples<\/a>. Scientists think they\u2019re \u201cgoing to find more and more examples of contemporary and subtle changes\u2026 that we\u2019re shaping, indirectly, in many more species,\u201d says Roslyn Dakin<\/a>, an animal behaviorist at Carleton University in Canada who was not involved with the new research, to Science<\/em>.<\/p>\n

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