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The quest to revive extinct Aurochs to restore ancient lands

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Rewilding and restoration of land often rely on the reintroduction of species. But what happens when what you want to reintroduce no longer exists? What if the animal in question is not only locally extinct, but gone for good? Yes, this might sound like the plot of Jurassic Park. But in real life this is actually happening in the case of the Aurochs ( Bos primigenius ). This wild ancestor of all modern cattle has not been seen since the last individual died in 1627 , in today’s Poland. Aurochs have been deep within the human psyche for as long as there have been humans, as attested by their prominence in cave art. However, the advent of agriculture and domestication put the magnificent animal on a path to extinction. So why bring the Aurochs back today and how? And what is the likely outcome? What is left of Aurochs, besides their depiction in cave paintings, are some fossil remains and some descriptions in the historical record. “Their strength and speed are extraordinary,” w
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Cranium of a four-million-year-old hominin shows similarities to that of modern humans

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Original picture (left) and virtual rendering of the Jacovec cranium (middle) with two sections revealing the inner structure (right). Credit: Amelie Beaudet

A cranium of a four-million-year-old fossil, that, in 1995 was described as the oldest evidence of human evolution in South Africa, has shown similarities to that of our own, when scanned through high resolution imaging systems.

The cranium of the extinct Australopithecus genus was found in the lower-lying deposits of the Jacovec Cavern in the Sterkfontein Caves, about 40km North-West of Johannesburg in South Africa. Dr Amelie Beaudet from the School of Geography, Archaeology and Environmental Studies of the University of the Witwatersrand and her colleagues from the Sterkfontein team scanned the cranium at the Evolutionary Studies Institute, based at the University of the Witwatersrand, in 2016 and applied advanced imaging techniques in "virtual paleontology" to further explore the anatomy of the cranium. Their research was funded by the Centre of Excellence in Palaeosciences, the Claude Leon Foundation and the French Institute of South Africa and was published in the Journal of Human Evolution.

"The Jacovec cranium represents a unique opportunity to learn more about the biology and diversity of our ancestors and their relatives and, ultimately, about their evolution," says Beaudet. "Unfortunately, the cranium is highly fragmentary and not much could be said about the identity nor the anatomy of the Jacovec specimen before."

Through high resolution scanning, the researchers were able to quantitatively and non-invasively explore fine details of the inner anatomy of the Jacovec specimen and to report previously unknown information about the genus Australopithecus.

"Our study revealed that the cranium of the Jacovec specimen and of the Ausralopithecus specimens from Sterkfontein in general was thick and essentially composed of spongy bone," says Beaudet. "This large portion of spongy bone, also found in our own cranium, may indicate that blood flow in the brain of Australopithecus may have been comparable to us, and/or that the braincase had an important role in the protection of the evolving brain."

In comparing this cranium to that of another extinct group of our family tree, Paranthropus, that lived in South Africa along with the first humans less than two-million-years ago, their study revealed an intriguing and unexpected aspect of the cranial anatomy in this genus.

"We also found that the Paranthropus cranium was relatively thin and essentially composed of compact bone. This result is of particular interest, as it may suggest a different biology," says Beaudet.

Situated in the Cradle of humankind, a Unesco World Heritage Site, the South African paleontological sites have played a pivotal role in the exploration of our origins. In particular, the Sterkfontein Caves site has been one of the most prolific fossil localities in Africa, with over 800 hominin remains representing 3 genera of hominin recovered since 1936, including the first adult Australopithecus, the iconic "Mrs Ples" and "Little Foot," the most complete single skeleton of an early hominin yet found.

"The Jacovec cranium exemplifies the relevance of the Sterkfontein fossil specimens for our understanding of human evolution," says Beaudet. "Imaging techniques open unique perspectives for revisiting the South African fossil assemblage."
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Materials provided by University of the Witwatersrand. Note: Content may be edited for style and length.

University of the Witwatersrand. (2018, June 25). Cranium of a four-million-year-old hominin shows similarities to that of modern humans: The 'virtual' revisiting of a fossil described as 'the oldest evidence of human evolution in South Africa' shows surprising results. ScienceDaily. Retrieved July 31, 2018 from www.sciencedaily.com/releases/2018/06/180625130919.htm


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