Le wallaby est un nom vernaculaire donné à un ensemble de marsupiaux semblables à des kangourous de petite taille. Il n’y a pas de définition stricte du mot : on appelle wallaby tout macropodidés qui est considéré comme n’étant pas assez grand pour faire partie des kangourous au sens strict ou qui n’a pas reçu une autre dénomination. Les espèces du genre Macropus (tel le wallaby de Bennett) constituent le groupe principal au sein des wallabys aux côtés des lièvre-wallabys, des pétrogales (ou wallabies des rochers), et des thylogales (ou pademelons, wallabies nains et forestiers). Le wallaby bicolore est l’unique représentant du genre Wallabia. En théorie, on exclut des wallabies, les wallaroos (Macropus robustus) dont la taille est intermédiaire entre les kangourous et les wallabies.
Le wallaby peut être vu dans de nombreux parcs zoologiques français et européens. Le climat océanique de sa provenance d’origine (Australie orientale et Tasmanie) est très proche du climat européen, ce qui explique en grande partie pourquoi le wallaby de Bennet est celui qui s’est le mieux adapté au continent européen. Grâce à son épaisse fourrure, il peut en effet supporter des températures relativement basses. De plus, il se reproduit relativement bien. En France, depuis le début des années 1970, des wallabys de Bennett échappés du parc zoologique de Sauvage, situé à Émancé, colonisent le sud de la forêt de Rambouillet[1]. D’autres individus échappés d’enclos forment des colonies dans les îles Britanniques, sur l’Île de Man depuis les années 1960[2] et sur l’île Lambay en Irlande depuis août 2022[3].
D’anciennes populatons australienness, il y environ 12.000 ans élevaient des kangoiroud dont ils consommaoe la chait et la fpittore. Ségissant de populations nodess vovant dans les iles indonésiennesles iles indos n 10.ààà Humans established a wild population of brown forest wallabies in the Raja Ampat Islands thousands of years ago for their meat and fur in one of the earliest known species translocations
Be As early as 12,800 years ago, people captured wild wallabies and transported them in canoes to islands dozens or even hundreds of kilometres away.
Native to Sahul – the prehistoric landmass that later split into Australia and New Guinea – the marsupials probably accompanied human explorers and traders to islands across South-East Asia as sources of food, decorative pelts and eventually bone tools. The imported animals established colonies and thrived there for thousands of years, in one of the world’s oldest known cases of animal translocation, says Dylan Gaffney at the University of Oxford.
“This builds into a global picture where these early people were moving, managing and rearing animals in much more complicated and purposeful ways than we thought – possibly in some ways that early agriculturalists would have,” he says. “They weren’t just surviving in these tropical island environments; they were actively shaping them.”
Scientific work on species translocations has typically focused on European explorers – like their introduction of invasive rabbits into Australia in the 18th and 19th centuries, or the reintroduction of horses to the Americas in the late 1400s and early 1500s.
But in the 1990s, researchers found bones of two kinds of marsupials – the cuscus (Phalanger orientalis breviceps or Phalanger breviceps) and the bandicoot (Echymipera kalubu) – on islands east of New Guinea, and brown forest wallabies (Dorcopsis muelleri) on islands as far west as Halmahera, about 350 kilometres away from the ancient coastline of Sahul.
How those animals got to the islands – whether by human transport or on their own – has not been established. To find out, Gaffney and his colleagues investigated a new archaeological site in the Raja Ampat Islands in Indonesia, which lay a few kilometers offshore from northwest Sahul when sea levels were low thousands of years ago.
There, skeletons with ages thousands of years apart suggest that colonies of brown forest wallabies lived and reproduced on the islands for generations before vanishing about 4000 years ago, for reasons yet unclear.
Radiocarbon dating in an inland cave showed people were butchering and cooking wallabies as early as 13,000 years ago – 5000 years earlier than on islands further west – and were still doing so around 4400 years ago.
The team also found several bone tools, probably used for hunting and textile work, including one confirmed by molecular analysis to have been made from a bone of the wallaby family about 4300 years ago.
To address the question of how the animals got there – and to islands farther away – the team used computer modelling, accounting for sea levels and environmental conditions at the time.
The modelling supports the idea that humans transported the animals by canoe, Gaffney says. Without human help, the wallabies would have had to swim across the open ocean for more than 24 hours in powerful currents or cling to vegetation rafts for up to 10 days to reach some of the islands, making their survival highly unlikely. And while it is feasible that the animals could have reached nearby islands by swimming, no one knows whether forest wallabies – modern or ancient – could swim at all.
Canoe trips, by contrast, would have lasted just a few hours to two days depending on the route – probably short enough for captive animals to survive the trip, he says.
The findings highlight just how far back human-driven species movements go – well before European colonial expansion, says Tom Matthews at the University of Birmingham, UK, who wasn’t involved in the study. “We often assume introductions only started in the last 500 years, but this shows humans were reshaping ecosystems thousands of years ago.”
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