International
Oldest human relative walked upright 7 mn years ago: study
AFP
The earliest known human ancestor walked on two feet as well as climbing through trees around seven million years ago, scientists said Wednesday after studying three limb bones.
When the skull of Sahelanthropus tchadensis was discovered in Chad in 2001, it pushed back the age of the oldest known representative species of humanity by a million years.
Nicknamed “Toumai”, the nearly complete cranium was thought to indicate that the species walked on two feet because of the position of its vertebral column and other factors.
However the subject triggered fierce debate among scientists, partly due to the scarcity and quality of the available bones, with some even claiming that Toumai was not a human relative but just an ancient ape.
In a study published in the Nature journal on Wednesday, a team of researchers exhaustively analysed a thigh bone and two forearm bones found at the same site as the Toumai skull.
“The skull tells us that Sahelanthropus is part of the human lineage,” said paleoanthropologist Franck Guy, one of the authors of the study.
The new research on the limb bones demonstrates that walking on two feet was its “preferred mode of getting around, depending on the situation,” he told a press conference.
But they also sometimes moved through the trees, he added.
– ‘Not a magical trait’ –
The leg and arm bones were found alongside thousands of other fossils in 2001, and the researchers were not able to confirm that they belonged to the same individual as the Toumai skull.
After years of testing and measuring the bones, they identified 23 characteristics which were then compared to fossils from great apes as well as hominins — which are species more closely related to humans than chimpanzees.
They concluded that “these characteristics are much closer to what would be seen in a hominin than any other primate,” the study’s lead author Guillaume Daver told the press conference.
For example, the forearm bones did not show evidence that the Sahelanthropus leaned on the back of its hands, as is done by gorillas and chimpanzees.
The Sahelanthropus lived in an area with a combination of forests, palm groves and tropical savannahs, meaning that being able to both walk and climb through trees would have been an advantage.
There have been previous suggestions that it was the ability to walk on two feet that drove humans to evolve separately from chimpanzees, putting us on the path to where we are today.
However the researchers emphasised that what made Sahelanthropus human was its ability to adapt to its environment.
“Bipedalism (walking on two legs) is not a magical trait that strictly defines humanity,” paleontologist Jean-Renaud Boisserie told the press conference.
“It is a characteristic that we find at the present time in all the representatives of humanity.”
– Our ‘bushy’ family tree –
Paleoanthropologist Antoine Balzeau of France’s National Museum of Natural History said the “extremely substantial” study gives “a more complete image of Toumai and therefore of the first humans”.
It also bolstered the theory that the human family tree is “bushy”, and was not like the “simplistic image of humans who follow one another, with abilities that improve over time,” Balzeau, who was not involved in the research, told AFP.
Daniel Lieberman, a professor of human evolutionary biology at Harvard University, said in a linked paper in Nature that the study’s “authors have squeezed as much information as possible from the fossil data”.
But he added that the research will not offer “full resolution” of the debate.
Milford Wolpoff, a paleoanthropologist at the US University of Michigan cast doubt on whether Toumai is a hominin, telling AFP that “extraordinary claims require extraordinary evidence”.
Wednesday’s study was carried out by researchers from the PALEVOPRIM paleontology institute, a collaboration between France’s CNRS research centre and Poitiers University, as well as scientists in Chad.
Guy said the team hopes to continue its research in Chad next year — “security permitting”.
Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.
International
Petro expresses concern over fatal shooting during mass protests in Lima
Colombian President Gustavo Petro voiced his “concern” on Thursday over recent events in Peru, following the death of a protester reportedly shot during a massive demonstration in Lima against the government and Congress.
“I must express my concern over the events in Peru. A young artist has been killed in citizens’ protests,” Petro wrote on X (formerly Twitter).
The Colombian leader also noted that in Peru, “a popularly elected president remains imprisoned without conviction,” referring to Pedro Castillo, who led the country from July 2021 to December 2022 until he was removed by Congress following a failed attempted coup.
“This is a blatant violation of the American Convention on Human Rights,” Petro stated, adding, “I hope Peru seeks social and political dialogue to legitimize its public institutions.”
On Wednesday, Peru experienced widespread protests in several cities, with the largest demonstration in Lima in recent years, driven by citizens’ concerns over corruption and public insecurity.
During the capital’s mobilization, the Ombudsman’s Office confirmed the death of Eduardo Ruiz, 32, and reported clashes that left over 100 injured, including 78 police officers and 24 protesters, as well as ten arrests.
The Attorney General’s Office, investigating Ruiz’s death “in the context of serious human rights violations,” confirmed that the protester was shot.
International
Peru’s interim president José Jerí refuses to resign after protester’s death in Lima
Peru’s interim president, José Jerí, stated Thursday that he has no intention of resigning from the post he assumed last Friday, following the removal of former president Dina Boluarte, despite growing unrest over the death of a protester during massive demonstrations in Lima on Wednesday.
“I will not resign,” Jerí declared outside the Government Palace in Lima, where he returned on foot after making a surprise visit to Congress headquarters alongside Prime Minister Ernesto Álvarez.
Earlier, after leaving the Legislative Palace, the president acknowledged that the country is going through “difficult times” and condemned what he described as “a small group attempting to impose an agenda different from the citizens’ expression of discontent.”
Jerí expressed condolences for the death of Eduardo Ruiz, a 32-year-old man who died during Wednesday’s protest against the government and Congress, amid growing anger over corruption and insecurity.
“We stand in solidarity with his family,” he said, without offering further details about the incident, which has sparked outrage among Peruvians.
The president also described the demonstrations as “a legitimate civic expression” that later turned violent due to “certain groups seeking to provoke chaos by exploiting a peaceful citizen movement.”
“In a state governed by the rule of law, the rights of both demonstrators and security forces must be protected,” Jerí emphasized, adding that “as a result of that situation, this unfortunate death occurred outside the main area where the protest was taking place.”
International
Mexican government prioritizes 191 communities after deadly floods
Mexican President Claudia Sheinbaum confirmed on Wednesday that the death toll from recent rains and floods across several central states has risen to 66, while the federal government has activated air bridges and prioritized assistance in 191 isolated communities.
“Unfortunately, 66 people have died, and 75 remain missing,” the president said during her morning press conference. She added that the official death toll will be updated later in a new report.
As of Tuesday, authorities had reported 64 fatalities. Sheinbaum also announced the creation of a public information center to centralize official data on the deceased, missing persons, damaged homes, and cut-off communities.
According to the president, the number of missing persons has decreased thanks to coordination with state authorities.
“Through calls to phone line 079, 103 people who had been reported missing have now been located,” she explained.
Priority Municipalities
The president noted that the federal government has classified 191 communities as ‘priority’, a designation based mainly on the percentage of homes affected.
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