Australia: captive-bred snakes return to the wild
· BehindLines newsroom
A reintroduction programme near Sydney is producing encouraging early results. According to the University of Technology Sydney (UTS), cited by Phys.org on November 6, at least four of the six captive-bred juvenile broad-headed snakes have survived their first months in the wild. UTS presents the release, carried out in mid-May 2026, as a world first for this threatened species.
A programme that began in 2024
According to the conservation group Aussie Ark, which announced the release on May 13, it all began in October 2024 with 17 adults brought together, a group later raised to 20 animals. Eight juveniles were born in captivity. Two stayed in the insurance population kept at Somersby, in New South Wales, and six were released at habitat restoration sites. Each carries a unique head pattern that allows it to be recognised individually.
The programme brings together UTS, Aussie Ark and the traditional owners of the Shoalhaven region. Indigenous rangers take part in the monitoring, with surveys every two weeks, UTS says.
Artificial rocks to hide under
Professor Jonathan Webb, an ecologist at UTS, has studied the species for more than thirty years. He explains that these snakes, which reach about 90 centimetres, depend on rocks to warm up and shelter, and that the stones also attract their prey. Yet the removal of rocks from the bush, recognised in 1999 by the New South Wales government as a threatening process, destroys these refuges.
To address this, artificial rocks designed by researcher Benjamin Croak reproduce the crevice sizes and thermal properties of natural stones. The released juveniles sheltered under them to warm up, stay protected and reach prey.
What this changes, and the limits
According to UTS, the population studied in Morton National Park had fallen by about 64% by 2023, after the 2017-2019 drought and the 2020 bushfires. The researchers remain cautious: long-term survival and breeding of the released animals have not yet been confirmed, and the study is a pilot project involving only six individuals.
Jonathan Webb describes the operation as a pilot study meant to guide future reintroductions, and hopes the populations will stop declining. He also calls for a permit system to tackle illegal rock removal, as some large decorative boulders sell for 450 dollars each.