A new study led by Monash University shows something remarkable. One in every ten butterfly species on Earth has changed where it lives. Scientists say climate change and extreme weather caused most of these changes. In fact, these two factors explain nearly 80 per cent of all the shifts recorded.
This is the biggest study of its kind so far. Researchers looked at 6,182 separate records of range shifts. These covered 1,758 butterfly species in 105 countries. The team didn’t just use English-language science papers. They also studied research written in other languages. They also spoke with 68 experts in the field.
Dr Shawan Chowdhury led the study. He runs the Global Change Ecology Lab at Monash. He says the results reveal how quickly nature is changing. They also expose big gaps in how we track that change.
“We found butterflies shifting their ranges on every continent where they live,” Dr Chowdhury explained. “The scale surprised us. And it’s not just happening in well-studied places like Europe and North America.”
He added that climate change is now a major force. It’s reshaping where species can actually survive. For many butterflies, moving is the only way to stay alive. They need to chase conditions that still suit them.
The study appeared in the journal Nature Ecology & Evolution. It found that 80 per cent of the species studied expanded into new territory. Warmer temperatures opened up areas that used to be too cold. Meanwhile, 27 per cent of species saw their ranges shrink instead. And 22 percent moved up or down mountains, following cooler or warmer air.
Interestingly, this kind of elevation shift was rarely recorded in tropical regions. That’s worrying, researchers say. Tropical butterflies tend to have very narrow temperature tolerances. Small changes can have a significant impact on them.
When the team checked country-by-country data, five European nations stood out. The Czech Republic, Finland, Luxembourg, Spain, and Sweden each had range-shift records for more than half of their butterfly species.
Looking more broadly, 32 countries had shift data for at least a quarter of their known species. Ten countries had records for more than half.
Dr Chowdhury pointed to one major finding. “We were missing a huge amount of evidence,” he said. “Once we added non-English studies and expert input, the whole global picture changed. Without that extra information, we’d have badly underestimated how widespread these shifts really are. We especially would have missed patterns in the tropics, where 80 per cent of all insect species actually live.”
The research also revealed serious blind spots. Central Africa, Southeast Asia, New Guinea, and the Amazon Basin are all major biodiversity hotspots. Yet they remain poorly studied.
“These are exactly the places where species are most at risk,” Dr Chowdhury said. “And they’re the places we understand the least.”
He explained that tropical butterflies already live near their upper heat limits. Even a slight temperature rise could push them past that edge. This danger grows when habitats Land clearing exacerbates this danger by fragmenting habitats. by land clearing. Butterflies need connected habitats to move and track livable climates.
The researchers are calling for better monitoring worldwide. They want it to be fair, standardised, and multilingual. Without these measures, they warn, conservation plans could be based on incomplete or skewed data.
“Butterflies act as early warning signs,” Dr Chowdhury said. “If their ranges are shifting this much, it points to more significant changes happening across whole ecosystems.”
He stressed the need for coordinated global tracking, especially in tropical regions. Scientists need to know what species are doing, where they’re heading, and how best to protect them. This effort ties directly into global targets set under the Kunming-Montreal Global Biodiversity Framework.
Researchers assert that the conclusion is unequivocal. Climate-driven species movement isn’t a distant possibility. It’s happening right now, and it’s speeding up. New conservation strategies are needed to keep pace with species already on the move.
