Little Dog Island Roars Back to Life: Penguins Return as Feral Predators Vanish
In a significant conservation triumph, the remote Little Dog Island in Tasmania’s Bass Strait is witnessing a remarkable ecological recovery, marked by the return of penguins for the first time in decades. This resurgence follows the successful eradication of invasive feral cats and possums, creatures that had long plagued the island’s fragile ecosystem.
Little Dog Island, a jewel within the Furneaux Group situated north-east of Tasmania, is a vital sanctuary for an estimated half a million nesting shearwaters each year. However, the island’s abundant birdlife, described as “spectacular,” has for years been under severe threat from introduced predators.
Dr. Sue Robinson, an invasive species biologist with Biosecurity Tasmania, explained that these destructive pests likely found their way to the island during periods when it was used for livestock grazing. “Mice would have probably come when Europeans came… or when livestock were brought to the island,” she noted. “And as soon as you’ve got mice, if people are living there, they usually bring cats with them. Particularly things like shearwaters, which are seasonal … they take quite a hammering from the cats.”
The Tide Turns: Eradication Efforts on Little Dog Island
The turning point for Little Dog Island came during the winters of 2022 and 2023, when Dr. Robinson and her dedicated team embarked on an ambitious mission to trap and humanely remove feral cats. Their efforts were met with considerable success, with 21 cats being captured and euthanised.
“Now on 83 hectares, that’s a lot of cats,” Dr. Robinson stated, highlighting the scale of the problem. “Clearly they would have been doing a lot of damage.”
Following the intensive trapping program, a comprehensive suite of monitoring activities was deployed to confirm the absence of feral cats. These included:
- Thermal imaging: Utilised to detect the heat signatures of any remaining animals.
- Scent detection dogs: Employed to sniff out the presence of cats.
- Motion sensing cameras: Deployed to capture any movement on the island.
These rigorous checks have, to date, yielded no evidence of feral cats remaining on the island.
A Welcome Return: Penguins Reclaim Their Habitat
The most poignant indicator of the island’s recovery is the reappearance of penguins. For the first time since the 1980s, these charming seabirds have been sighted on Little Dog Island. “Cats would have been killing penguins — and now they’re coming back,” Dr. Robinson confirmed, her voice filled with optimism.
Beyond the feline threat, Dr. Robinson’s team also successfully removed over one hundred possums from the island. She expressed strong confidence that possums have now been entirely eradicated. “They’re also really predatory when they are on a seabird island,” she added, underscoring the positive impact of their removal.
The significant eradication program was made possible through funding from the Commonwealth government and was expertly delivered by Tasmania’s Department of Natural Resources and Environment.
A Beacon of Hope for Feral Animal Management
The triumph on Little Dog Island serves as a powerful testament to the efficacy of targeted invasive species management and offers considerable encouragement for similar efforts across Australia. Dr. Robinson views the success as a positive omen for future feral cat eradication initiatives nationwide.
She drew a parallel to the 2018 declaration of Dirk Hartog Island in Western Australia as free from feral cats, an achievement that occurred 400 years after the Dutch explorer first landed there. “It’s always a great result to have an island free of feral predators… especially an island that’s important for seabirds,” she remarked. “Once you get them off, they’re unlikely to come back on.”
Federal Agriculture Minister Julie Collins lauded the outcome for Little Dog Island, emphasising the importance of collaborative action. “A coordinated approach like this to feral animal management maximises control efforts, increases information sharing and drives down negative impacts on our farmers and producers and the environment,” she stated. The revitalisation of Little Dog Island is a vivid reminder of what can be achieved when conservation efforts are well-resourced and strategically implemented.
