The key factors for large carnivore rewilding success included using younger animals, wild-born animals, with an acclimatisation period

The findings are based on data from almost 300 relocations of large carnivores, from wolves to bears and showed a high overall success rate, with a significant increase over recent years. But the low mating success of relocated animals indicates ongoing challenges for rewilding programmes.

New research published today has identified the top factors that determine whether efforts to relocate large carnivores to different areas are successful or not. The findings could support global rewilding efforts, from lynx reintroductions in the UK to efforts to restore logged tropical forests.

As apex predators, large carnivores play crucial roles in ecosystems, however, their numbers have plummeted over recent decades.

Relocating large carnivores can support their conservation, for instance, to reintroduce a species to an area where it has been exterminated, or to reinforce an existing population to increase its viability.

But to date, there has been little information about what factors determine whether these (often costly) efforts are successful or not.

The study was carried out by an international team led by researchers at the University of Oxford’s Department of Biology, Wildlife Conservation Research Unit (WildCRU), and School of Geography and the Environment.

The group analysed data from almost 300 animal relocations which took place between 2007 and 2021. These spanned 22 countries on five continents, and involved 18 different carnivore species, including bears, hyenas, big cats, and wild dogs.

See also: India poised for cheetah reintroduction

collared leopard

key findings

Overall, two-thirds (66%) of the relocations were successful, where the animal survived in the wild for over six months.

Success rates for large carnivore relocations have increased significantly since before 2007. For wild-born carnivores, success rates increased from 53% pre-2007 to 70%; and for captive-born animals, success rates doubled from 32% in pre-2007 to 64%.

The species with the highest success rates included maned wolves, pumas, and ocelots which had a 100% success rate. The species with the lowest success rates (around 50%) were African lions, brown hyenas, cheetahs, Iberian lynx, and wolves.

Overall, using a ‘soft release’ increased the odds of success by 2.5-fold. This involves acclimatising the animal to the new environment before it is fully released.

Releasing younger animals, particularly one- to two-year-olds, also increased success rates. This may be because younger animals have greater behavioural plasticity to adapt to new environments, and they are less likely to have developed homing behaviours.

For animals born in captivity, the success rate decreased by 1.5-fold, compared with animals born in the wild.

However, just over a third (37%) of the relocated animals were observed to find a mate and/ or raise a cub in their new habitat.

low mating success

Although the fact that most relocated animals survived is encouraging, the authors say that the low mating success shows the ongoing challenges facing rewilding efforts and, crucially, the importance of protecting habitats that already exist.

Lead author Seth Thomas (Department of Biology, University of Oxford) remarked: “In the last 15 years we have become more successful at translocating and reintroducing large carnivores.

“This allows us to be optimistic for the future of rebuilding damaged ecosystems around the globe, but we must remember that it is always more important to protect large carnivore populations where they are now before we lose them.

“Even as we have grown to be more successful, 34% of individual translocations fail and they cannot be seen as a replacement for immediate conservation action to save these populations.”

In the near future, relocating large carnivores may become increasingly necessary as habitats become altered due to climate change, and if land use changes increase conflict between humans and animals.

In the UK, one of the most Nature-deprived countries in the world, there have been calls to reintroduce formerly native apex predators, such as wolves and the Eurasian lynx.


political appetite

Professor David Macdonald (WildCRU, Department of Biology, University of Oxford), a co-author for the study, said: “As the UN decade of ecosystem restoration gets underway, the ecological need and political appetite for relocations of large carnivores has never been greater, and they have the potential to contribute more now than ever before to biodiversity conservation.

“By scrutinising the most geographically comprehensive sample of relocated large carnivores to date, our study makes plain to conservationists and policymakers the urgency of improving rewilding efforts.”

Dr Miha Krofel of the University of Ljubljana, a co-author who worked on lynx reintroductions included in the study said: “The main reason that allowed us to quantify the higher rate of success is the wider applicability of tracking technology compared to 15 years ago.

“Nowadays, many practitioners and scientists fit animals with tracking tags for better post-release monitoring of the translocated individuals. This allows us to learn from past releases to improve our interventions in the future.”

Image 1: Goru, a Eurasian Lynx, who was relocated in 2019 as part of the LIFE Lynx project to save the Slovenian South East Alpine population. Since his release, Goru has reproduced at least three times. © Aleš Pičulin.

Image 2: The 2022 release of a collared leopard into North Ossetia (Central Caucasus), Russia. © Pavel Padalko.

Image 3: A puma known as Anhanguera is released into Serra do Japi, Jundiaí, state of São Paulo, Brazil, as part of the Vida Livre da Mata Ciliar programme. © Associação Mata Ciliar.