Overview of The Longest Fence in the World
This 99% Invisible episode (host Roman Mars; reported by Shirley Wong) tells the story of Australia’s Dingo Barrier Fence — the longest continuous fence on Earth — and the ecological, cultural, and political consequences of trying to exclude an apex predator from much of a continent. The episode traces the fence’s origins (from rabbit-proof lines to a dingo barrier), explains how it reshaped Australian landscapes and animal populations, and follows the fraught debate over coexistence, capped by a recent deadly incident on Gari (Fraser Island) that reignited conflicts between conservationists, Indigenous custodians, farmers, and government authorities.
Background & history
- Origin: European colonists introduced many species (rabbits, foxes, cats, deer, pigs) that devastated native ecosystems. The rabbit plague — started by 24 rabbits released by Thomas Austin — led to large-scale attempts to stop their spread with rabbit-proof fences.
- Wool and sheep expansion: Australia’s wool boom (19th–20th centuries) massively increased sheep grazing into interior regions, making flocks vulnerable to dingoes (native wild dogs).
- Shift in fence purpose: Defunct rabbit fences were reinforced, raised, and joined to exclude dingoes. At its largest the system approached ~9,600 km; today the dingo barrier fence is roughly 5,500–5,800 km (over 3,400 miles), cutting across several states.
- Predator control measures: Governments and farmers used bounties, professional hunters, and large aerial baiting campaigns (notably after WWII) to reduce dingo numbers.
How the fence functions and is maintained
- Structure: Simple wire fencing about six feet tall, patched and patrolled by teams of local fence patrolmen; thousands of repairs are routine because of wildlife and weather damage.
- Cost: Approximately $10 million per year, funded by state/local governments and a fence tax on sheep and cattle farmers.
- Purpose today: Keeps dingoes mostly out of arable/semi-arable eastern and southern Australia where most people live and sheep graze.
Ecological impacts
- Apex predator removal: Removing dingoes has cascading effects. Without dingoes:
- Kangaroo populations can explode, overgrazing vegetation and reducing habitat for small mammals, birds, and reptiles.
- Mesopredators like foxes and feral cats increase, contributing to declines and near-extinctions of native species (e.g., bilbies, bandicoots).
- Landscape-level changes: Vegetation composition differs noticeably on each side of the fence (more grasses/leaf cover where dingoes persist; more dry shrubs where they don’t). Studies suggest these differences are visible from satellite imagery and relate to dune morphology in desert areas.
- Ecological division: The fence has effectively created two distinct ecological “universes” across parts of the continent.
Dingoes, identity, and Indigenous relationships
- Biology & status: Dingoes descend from early Asian dogs brought to Australia 4,000–10,000 years ago and evolved to be genetically distinct. Debate remains about their “native” classification, but they have been integral to Australian ecosystems and human societies for millennia.
- Indigenous relationships: Aboriginal peoples (e.g., Butchela/Batchelor) historically had intimate, practical relationships with dingoes — using non-lethal management and viewing dingoes as partners in hunting and camp life. Indigenous ranger programs are central to modern dingo management on some lands.
- Cultural misrepresentation: For decades dingoes were seen as merely feral dogs; scientific work beginning in the mid-20th century reframed them as a unique, ecologically important species.
Gari (Fraser Island): a case study in coexistence and conflict
- Gari (Fraser Island) hosts an isolated dingo population legally protected since its UNESCO listing in 1992. The Butchela Aboriginal Corporation employs rangers and uses traditional practices to manage interactions.
- Tourism pressure: Hundreds of thousands of visitors — many encouraged to “see dingoes” — have habituated some dingoes to humans (feeding, scavenging), increasing risky encounters.
- High-profile incidents: Past attacks include mainland cases (e.g., “Dingo Ate My Baby”) and island incidents. A recent tragic death of Canadian tourist Piper James on Gari prompted the government to euthanize a pack of 10 dingoes found near the body.
- Controversy over response: Scientists and Indigenous leaders criticized the cull as ineffective and harmful to genetic diversity. The Butchela people say they were not consulted and view the dingoes as family; local rangers and elders advocate tourism restrictions and stronger, culturally-informed management.
Political and social dynamics
- The fence is politically symbolic: It represents agricultural heritage and rural livelihoods; advocating its removal is considered politically risky (“a political third rail”).
- Economic shifts: Wool and sheep are no longer the dominant economic drivers they once were, raising questions about whether the ecological and financial costs of maintaining the fence still match contemporary needs.
- Management tension: Farmers, conservation scientists, Indigenous communities, tourism operators, and governments all have competing priorities (livelihoods, species protection, public safety, cultural values).
Notable quotes
- “Tearing down the dingo fence is a political third rail.” — on the political risk of proposing removal.
- “These wongolies, they’re punished for doing what they do naturally.” — reflecting Indigenous grief over the culling of dingoes after the Gari tragedy.
Key takeaways
- The Dingo Barrier Fence is a massive human-made divider that reshaped Australian ecology, economy, and culture.
- Predator exclusion solved immediate agricultural problems but created long-term ecological imbalances visible at landscape scale.
- Dingoes are ecologically important and culturally significant; their management involves complex trade-offs between conservation, agriculture, tourism, and public safety.
- Recent events on Gari highlight how tourism-driven habituation, inadequate consultation with Indigenous managers, and heavy-handed responses can worsen outcomes for both humans and dingoes.
Practical recommendations (proposed by scientists and Indigenous custodians interviewed)
- Limit or cap visitor numbers to sensitive areas (e.g., seasonal closures on Gari) to reduce habituation.
- Strengthen visitor education and strict enforcement of no-feeding/no-approach rules; redesign tourism marketing that anthropomorphizes dingoes.
- Prioritize non-lethal, culturally-informed management strategies and involve traditional owners (Aboriginal corporations) in decision-making.
- Reassess long-term role and funding of the fence in light of changed economies and ecological science; consider targeted conservation and restoration strategies where feasible.
- Avoid reactive culls that harm genetic diversity and may not enhance long-term safety.
Credits
- Host: Roman Mars
- Reporter: Shirley Wong
- Produced/edited by: Emmett Fitzgerald (with Kelly Prime)
- Mixed by: Martine Gonzalez
- Music: Swan Real and George Langford
- Fact-checking: Sona Avakian
- Episode source: 99% Invisible
(For listeners: the episode includes more on-the-ground reporting from Jindawi, interviews with ecologists and Indigenous rangers, and archival references such as a Steve Irwin segment on the dingo fence.)