Everyday obstacles threatening koalas
From power poles and fences to railway signs and backyard structures, the everyday infrastructure most Australians rarely notice is creating hidden hazards for endangered koalas, according to new CQUniversity research.
Published in the Australian Zoologist, the study examined hundreds of scientific publications, historical records, wildlife reports, news stories and social media posts collected over three years to better understand how koalas interact with human-made structures as urban development expands.
Lead author and CQUniversity Koala Research-CQ researcher Dr Rolf Schlagloth said the research was inspired by years of unusual koala rescues that often made headlines but were rarely reflected in scientific records.
"Over many years of researching and rescuing koalas, we kept seeing animals stranded in unusual places like power infrastructure, fences and railway signs," Dr Schlagloth said.
"These stories often attract attention because people think they're unusual or even amusing, but they point to a much bigger conservation issue that hasn't received the attention it deserves."
The research found almost 40 per cent of documented encounters between koalas and human-made obstacles involved power poles, light poles and signs, while 30 per cent involved fences. A further 22 per cent involved structures such as buildings, letterboxes, boats and buses, often used as makeshift refuges after habitat loss.
Dr Schlagloth said the findings highlight that protecting koalas involves much more than conserving habitat.
"People often think habitat loss is the only issue facing koalas, but even where habitat remains, the built environment can create serious challenges," he said.
"Every fence, power pole, road or building represents another obstacle a koala must negotiate simply to find food, shelter or a mate."
It is known that koalas spend an average of just three minutes each day on the ground, making every journey between trees increasingly risky as landscapes become more fragmented.
In many areas where koalas regularly move through rural, peri-urban and urban environments, Dr Schlagloth said these interactions are becoming increasingly common.
"We frequently hear anecdotal reports of koalas climbing railway infrastructure, power poles and other structures," he said.
"That prompted us to ask whether these were isolated incidents or part of a much broader pattern occurring across the koala's range."
The researchers found many of these incidents are not routinely recorded when injured koalas are admitted to wildlife hospitals or rehabilitation centres, meaning the role of human-made obstacles may be significantly underestimated.
"These cases are often simply recorded as a rescue, misadventure or unknown incident," Dr Schlagloth said.
"If we don't record what caused the problem, it's much harder to understand how infrastructure is affecting koala welfare or identify practical solutions."
While dramatic koala rescues often generate widespread attention on social media, Dr Schlagloth said they should be viewed as opportunities to improve how communities are designed.
"Every time a koala is rescued from a fence, drain or construction site, it's a reminder that we've built something without fully considering the wildlife that shares these landscapes," he said.
"The good news is that many of these risks are preventable."
The researchers are calling for greater consideration of koalas in planning, infrastructure design and wildlife management, including koala-friendly fencing, retaining habitat corridors, installing protective shields on power and rail infrastructure, improving wildlife monitoring and strengthening planning guidelines in areas where koalas are known to occur.
"Small, practical design changes can make a significant difference," Dr Schlagloth said.
"We don't just need to protect koala habitat. We also need to make the places we build safer for wildlife.
"As Australia continues to grow, we have an opportunity to create communities where people and koalas can safely coexist."
The paper, Where does that ladder lead to? Koalas encountering anthropogenic obstacles in an increasingly urbanised habitat, is a collaboration from Koala Research-CQ and Koala History & Sustainability Research Cluster.
