New research was released on January 1, 2022, that had a shocking conclusion: animals are shape-shifting in response to climate change. The research comes from scientists at Deakin University in Australia and traces how 30 species have responded to rising global temperatures.
Let’s dive into what shape-shifting means and explore three animals that are changing in response to global warming.
Climate Change is Having Big Impacts on Animals

Increasing global temperatures affect all of us, especially animal species.
©Jordan Hill Photography/Shutterstock.com
The research from Deakin University studied how animals are coping with increased temperatures. In warm-blooded species, such as mammals and birds, certain body parts are growing larger to better control body temperatures. Researchers studied growth in body parts such as beaks, ears, and legs to determine whether species were changing with the rise in global temperatures.
The conclusion: body parts such as beaks and mammalian ears are growing in response to climate change. One note: this doesn’t mean that animals are getting larger overall. Instead, they are growing parts of their body capable of dissipating heat.
Let’s dive into three animals the study singled out as rapidly evolving or “shape-shifting” to respond to changes in global temperatures.
Australian Parrots

Parrots have seen bill surface area increase by 4 to 10% since the 19th century.
©iStock.com/Pedro Ferreira do Amaral
Some of the most obvious shape-shifting from animals was found in Australian parrots, which have seen their bill surface area grow by up to 10% since the 19th century. Researchers noted the following:
Among these, Australian parrots have shown, on average, a 4%–10% increase in bill surface area since 1871, which was positively predicted by the average summer temperature in the years preceding the collection date.
Parrots are especially noteworthy because they don’t just live in climates susceptible to extreme temperature swings. They live in equatorial regions with climates that see relatively stable temperatures throughout the year.
Dark-Eyed Junco

Dark-eyed juncos live across North America and their bills are steadily growing due to climate change.
©C. Hamilton/Shutterstock.com
In addition to parrots, researchers noted that the dark-eyed junco “shows an association between increased bill size and short-term relative temperature extremes in typically cold environments.”
Their conclusion? Extreme weather events are causing changes to the body of dark-eyed juncos.
Great Roundleaf Bat

Great roundleaf bats saw an increase to their wing size due to climate change.
©Binturong-tonoscarpe/Shutterstock.com
Species such as bats and shrews are exhibiting morphological changes from climate change. The species saw relative increases in bat’s wings, ears, tails, and legs.
Researchers controlled for factors that could be impacting the growth of certain body parts in animals. They found that climate change was responsible for at least half of the growth across species studied. Here’s what their reports said:
Siepielski et al. showed that both maximum and mean temperatures explained almost half of the overall variation in morphology within studies, regardless of whether the trait increased or decreased in size. Siepielski et al. emphasized the importance of climatic fluctuations in the strength, direction, and form of selection seen in wild populations, but they also emphasized that the direction of selection changes frequently.
Are There Other Species Adapting to Climate Change?

The ears of donkeys help them stay cool in desert climates.
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Donkeys are a prime example of animals that have adapted to a desert climate. Their large ears have an extensive network of blood vessels that help them to dispel body heat when needed. Multiple species appear to be adopting similar heat-dissipating tactics, though more research is needed.
The bottom line? While species are rapidly changing, there’s no telling whether they’ll be able to evolve rapidly enough to keep up with climate changes. This will certainly be an area with significant scientific research in the years ahead!
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