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Did toxic algae kill hundreds of elephants in Botswana?

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Did toxic algae kill hundreds of elephants in Botswana?

An investigation into the sudden deaths of at least 350 elephants in Botswana in 2020 has revealed the cause was almost certainly a “toxic brew” of open water tainted by a species of cyanobacteria that released cyanotoxins, essentially contaminating the elephants’ watering holes.

According to researchers, approximately 20 watering holes in Botswana’s Okavango Delta had been contaminated across roughly 6,000sq km (2,316 square miles).

So what happened, and how?

What is cyanobacteria and how does it harm elephants?

Although not all cyanobacteria, commonly referred to as blue-green algae, is toxic, some cyanobacteria can produce a type of deadly algal blooms (HABs) in standing water. This is the type which was discovered in the investigation carried out by researchers at King’s College London.

The study showed that the African elephants (Loxodonta africana) died in May and June 2020 after drinking from water holes contaminated with these toxic algal blooms.

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“Scientists believe that the production of cyanotoxins is related to certain environmental triggers, for example, sudden rise in water temperature, nutrient loading, salinity,” Davide Lomeo, Earth observation scientist at King’s College London, a collaborator with Plymouth Marine Laboratory and the Natural History Museum in London, and lead researcher in the recent study, told Al Jazeera.

How did the elephant deaths come to light?

In early to mid-2020, a series of routine aerial surveys conducted by helicopter by the conservation organisation, Elephants Without Borders, revealed multiple elephant carcasses scattered across the landscape of the Ngamiland district of northern Botswana.

The aerial survey showed 161 elephant carcasses and 222 sets of bones, while also counting 2,682 live elephants throughout the eastern region of the Okavango Panhandle. In addition, the distance between the dead elephants indicated the deaths had been sudden, rather than gradual.

“The strong clustering of carcasses also suggests that the event was sudden, with limited dispersal of elephants prior to death,” the authors of the study said.

A combination photo shows dead elephants in Okavango Delta, 2020 [Handout via Reuters]

How did researchers identify toxic algae as the cause of death?

Before researchers confirmed it was toxic algae which killed the elephants, they had to rule out several other probable causes.

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“Although this area is a known poaching hotspot in Botswana, this was ruled out since elephant carcasses were found with tusks intact,” the authors of the study said.

Other initial theories included virulent and bacterial causes, such as encephalomyocarditis virus or anthrax, but the evidence taken from the field – such as the age of the dead elephants and the absence of any clinical signs of disease, meant the researchers ruled these out as the cause.

The distribution of carcasses and bones suggested a unique “spatial pattern”, which indicated that localised factors may have played a role in the mass die-off. This led to further exploration of specific environmental and ecological conditions in the affected areas.

There were several other factors that served as evidence that the elephant watering holes were to blame. Using satellite photos, researchers measured the distance the elephants walked after they drank from the watering holes – an average of 16.5km (10.2 miles). Many of the elephants died shortly thereafter, roughly 3.6 days (88 hours), after they drank from the nearby contaminated water holes.

The report states that 88 hours aligned with previously reported toxicological timelines for other large mammals which have died from blue algal poisoning.

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In addition, Lomeo’s previous body of doctoral work investigating the history of mass-mortality events and water quality in waterbodies in Africa served as evidence to further look into the theory of water hole contamination.

“This event was what led to this idea, since it was a well-covered news at the time, but no one really knew why they died. I then applied my skills in geospatial and computational data science to investigate the event under a well-known set of methods typically applied in epidemiological investigations (eg COVID-19),” explained Lomeo.

algae
Blooming blue-green algae caused by cyanobacteria in water bodies, rivers and lakes can be poisonous for animals [Shutterstock]

What is still unknown about the elephant deaths?

It is impossible to measure the level of toxicity for each waterhole from aerial photos. In addition, it is unclear whether elephants drank from one watering hole or several, according to researchers.

“It is highly likely that they drank from multiple pans before their death. It cannot be established if the fatal intoxication occurred in a single drinking event, but it seems more plausible that if cyanotoxins were present and were the cause of the die-off, this was through toxins bioaccumulation in elephants’ organs,” stated the study.

Although it is clear that the toxic waterholes were the likely source of the elephants’ mass mortality, there remains some uncertainty about the findings due to the timing of the mass die-off.

“The event occurred during the COVID-19 movement restrictions, and timely intervention was not possible. Therefore, tissue samples [which would have confirmed the presence/ absence of cyanotoxins] were not collected. Post-mortem investigations also need to be done within a certain timeframe, beyond which samples would be too degraded. Additionally, cyanotoxins cannot be detected from satellites, so the links can only be but indirect,” Lomeo explained.

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As the aerial data was collected considerable time after the deaths in March and May 2020 – researchers could not definitively rule out the involvement of other animals in the elephant deaths.

Furthermore, smaller creatures may have been missed in the aerial survey, potentially limiting scientists’ understanding of the full scope of the incident.

“The area is well-known for very high predation rates, meaning that animal carcasses disappear quickly because of scavengers like hyenas and vultures. Hence, the involvement of other animals cannot be ruled out,” Lomeo said.

The specific conditions that would produce the level of toxicity in a watering hole that would be lethal to surrounding animal species are also still unknown.

“There is still uncertainty. We know that certain cyanobacteria species are more likely to produce cyanotoxins, and we know which toxins each species typically produces,” said Lomeo.

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According to the research, cyanotoxins exhibit significant variations in their potency and effects. Certain types are extremely toxic, capable of causing death even in very small concentrations. Others, while less immediately dangerous, may still pose health risks at higher levels without necessarily being lethal. The field of cyanotoxin research remains active, with many aspects yet to be fully understood and explored.

Despite this, the overall findings of the study have been widely accepted. “The cause of the die-off has been officially attributed by the Government of Botswana to environmental intoxication by cyanobacterial toxins, also known as cyanotoxins,” the study’s authors said.

Could this happen again?

Although mass deaths of elephants are rare, researchers cannot be certain it will not happen again and that it will only affect elephants or land animals.

“[In] all arid systems where animals are dependent on stagnant water in lakes/ponds are susceptible to this [mass die-offs], the aquatic life in lakes also can be harmed in this same manner. We have even seen this in rivers and oceans where high nitrification from agricultural run-off combined with warming temperatures leads to disastrous bacterial blooms,” George Wittemyer, a behavioural ecologist at Colorado State University, one of the institutes involved in a study in Kenya that revealed that elephants use individual names, told Al Jazeera.

While it was relatively easy for researchers to identify the elephant carcasses from the air due to their size, the sudden deaths of smaller animals might not be so easy to identify.

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A South Korean startup captures workers’ techniques to develop AI brains for robots

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A South Korean startup captures workers’ techniques to develop AI brains for robots

SEOUL, South Korea (AP) — His head, chest and hands strapped with body cameras, David Park deftly folded a banquet napkin the way he has thousands of times during his nine years at the five-star Lotte Hotel Seoul. Each of his motions is fed into a database that will one day teach a robot to do the same.

The hotel chain is one of many companies South Korean artificial-intelligence startup RLWRLD (pronounced “real world”) is working with to create an extensive library of human expertise, harvested from skilled workers across industries, to develop AI brains for robots that could be coming to industrial sites and homes.

It collects similar data from logistics workers at CJ, capturing how they grip, lift and handle goods in warehouses, and from staff at a Japanese convenience store chain Lawson, tracking how they organize food displays.

The goal is to build an AI software layer that can work in robots across a range of factories and other work sites in coming years, before potentially expanding into homes. RLWRLD’s engineers say replicating the dexterity of human hands is a key priority, reflecting their views that humanlike machines, or humanoids, will drive the field.

“I’ve been doing this about once a month,” said Park, one of about 10 members of Lotte Hotel’s food and beverages team being wired up to capture their techniques.

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After folding the napkin into a tight, layered square, Park wiped wine glasses, knives and forks in a corner of a banquet hall as colleagues prepared for real services nearby. He complained lightly to an engineer that the cameras on his hands felt too tight.

South Korea focuses on physical AI

RLWRLD is among a wave of South Korean high-tech firms and manufacturers competing in the unproven yet fiercely contested global market for “physical AI.” The term refers to machines equipped with AI and sensors that can perceive, decide and act in real-world environments with some degree of autonomy, moving beyond conventional factory robots designed for repetitive tasks.

While it remains unclear whether these machines will fully meet expectations of transforming industries, they are central to South Korea’s ambitions to leverage its semiconductor and manufacturing strengths to become an AI powerhouse. The competition is tough, with U.S. tech giants like Tesla and a flood of Chinese firms pouring billions into humanoids and other AI robots.

Just as chatbots such as ChatGPT and Gemini train on vast troves of internet text, AI robots likewise require extensive data on human action to handle advanced physical tasks. South Koreans may struggle to compete in chatbots, where English language proficiency gives U.S. firms major advantages, but they see a better chance in physical AI, given their deep base of skilled workers in manufacturing and other sectors that could help train robot systems.

Robots are central to South Korea’s AI ambitions

The government last month announced a $33 million project to capture the “instinctive know-how and skills” of “master technicians” into a database for AI-powered manufacturing, hoping robots will boost productivity and offset an aging, shrinking workforce.

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RLWRLD, which last week unveiled its robotics foundation model, an AI system for robots, expects industrial AI robots to be deployed at scale sometime around 2028, a timeline shared by major businesses.

Hyundai Motor plans to introduce humanoids built by its robotics unit, Boston Dynamics, at its global factories in coming years, starting with its Georgia plant in 2028. Chip giant Samsung Electronics plans to convert all manufacturing sites into “AI-driven factories” by 2030, with humanoids and task-specific robots across production lines.

“South Korea has a highly developed manufacturing sector and the focus is squarely on humanoids tailored specifically for those industries,” said Billy Choi, a professor at Korea University’s center for Human-Inspired AI Research.

South Korea’s AI push has unsettled labor groups, who fear robots could possibly take jobs and hollow out the skilled workforce long seen as the nation’s competitive edge, the very asset it’s now counting on for its AI transition.

After Hyundai’s union warned in January that robots could trigger an “employment shock,” President Lee Jae Myung issued a rare rebuke, describing AI as an unstoppable “massive cart” and calling for unionists to adapt to changes “coming faster than expected.”

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“Mastery of skills is ultimately a human achievement — even if AI can replicate existing abilities, the continuous development of craft will remain fundamentally human,” said Kim Seok, policy director at the Korean Confederation of Trade Unions. He said widespread robot deployments would risk “severing the pipeline” for skilled labor and urged the government and employers to engage with workers over AI to win their buy-in and ease job concerns.

Robots are trained on human behavior

Humanoids developed by U.S. and Chinese companies have displayed impressive physical feats, even long-distance running. But Hyemin Cho, who handles business strategies at RLWRLD, said the ability to perform delicate tasks with hands will determine whether humanoids can be used in diverse industrial settings and homes.

“Capturing motion data in real-world settings is extremely important and the quality of that data matters greatly,” she said.

After converting worker footage into machine-readable data, RLWRLD’s engineers add another layer by repeating those tasks wearing cameras, VR headsets and motion-tracking gloves. That data is used to train test robots, often guided by RLWRLD “pilots” using wearable devices. The process captures fine details such as joint angles and the amount of force applied, said Song Hyun-ji of the company’s robotics team.

One of RLWRLD’s labs occupies a cluttered, 34th-floor suite at Lotte Hotel. Scratched carpets are buried under tangles of wires and computing gear. Poles fitted with infrared laser readers stand in the corners. Beneath a chandelier, a rare trace of the room’s former luxury, a wheeled robot with black, humanlike metal hands moves back and forth with a low mechanical whir.

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During a recent demonstration, the robot, guided by engineers, gingerly lifted and placed cups at a minibar, at one point knocking over a dish. The company’s latest test footage shows a more advanced system: a humanoid carefully opening a box, placing a computer mouse inside, closing it and setting it on a conveyor belt.

Most robots, including Boston Dynamics’ Atlas, use task-specific hands, like two or three-fingered “grippers.” RLWRLD is among a smaller group of companies developing AI for five-fingered hands that mimic human touch.

While five-fingered designs may not always suit factory needs, they could prove crucial as robots move into homes, where closer interaction with humans will be required, said Choi, the professor.

Hospitality workers provide valuable training data for machines learning precise or nuanced tasks — skills that could also expand their use in industrial settings, Cho said.

Although current humanoids would need several hours to clean a guest room that human workers finish in about 40 minutes, Lotte Hotel hopes robots will be ready for cleaning and other behind-the-scenes tasks by 2029. It also plans robot rental services for the hospitality and other service industries, with a potential expansion to homes.

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“If you look at the entire process of preparing for an event in back-of-house areas, we think humanoids might be able to take over about 30% to 40% of that workload,” Park said. “It will be difficult for them to replace the remaining 50%, 60% and 70%, which involves actual human-to-human interaction.”

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Trump administration rejects UN migration declaration, says ‘mass migration was never safe’

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Trump administration rejects UN migration declaration, says ‘mass migration was never safe’

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The U.S. ​State Department ‌announced on Monday that it refused to back an ​International Migration Review Forum “progress” declaration, ​accusing the U.N. of efforts to “advocate and facilitate replacement immigration in the United States and across the broader West.”

The U.S. did not participate in the second International Migration Review Forum, held May 5–8 at U.N. Headquarters in New York, and will not support the declaration, the department said in a statement on Monday.

The forum is the U.N.’s main global platform for member states to review implementation of the Global Compact for Safe, Orderly and Regular Migration, according to the U.N. Network on Migration. The 2026 forum was scheduled to produce an intergovernmentally agreed “Progress Declaration.”

President Donald Trump ended U.S. participation in the U.N. process to develop the Global Compact for Migration during his first term in 2017, and now the State Department says the federal government will again affirm its opposition.

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TRUMP PULLS US OUT OF UN-LINKED MIGRATION FORUM IN BOLD IMMIGRATION MOVE

President Donald Trump ended U.S. participation in the U.N. process to develop the Global Compact for Migration during his first term in 2017. (AP Photo/Evan Vucci)

The Global Compact was adopted in 2018 after the U.S. withdrew from the process. The U.N. and International Organization for Migration describe the compact as a cooperative framework intended to improve migration governance across countries.

“As Secretary Rubio said, opening our doors to mass migration was a grave mistake that threatens the cohesion of our societies and the future of our peoples,” the department’s statement reads. “ In recent years, Americans witnessed first-hand how mass immigration laid waste to our communities: crime and chaos at the border, states of emergency in major cities, and billions of taxpayer dollars funneled towards hotels, plane tickets, cell phones and cash cards for migrants.”

“Much of this was driven by UN agencies and their partners, which did not just facilitate the invasion of our country, but proceeded to redistribute our own people’s wealth and resources to millions of foreigners from the worst corners of the world,” it continued.

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The department argued there was nothing safe, orderly or regular about any of this, adding that the costs “were borne primarily by working Americans forced to compete for scarce jobs, housing, and social services.”

“The UN has little to say about them,” the department wrote.

TRUMP UNVEILS ‘REVERSE MIGRATION’ PLAN TO HALT ‘THIRD WORLD’ IMMIGRATION, REVOKE BIDEN-ERA ENTRIES

The U.S. refused to participate in an International Migration Review Forum. ( Alex Brandon / POOL / AFP via Getty Images)

“President Trump is focused on the interests of Americans, not foreigners or globalist bureaucrats,” the statement reads. ”The United States will not support a process that imposes, overtly or by stealth, guidelines, standards, or commitments that constrain the American people’s sovereign, democratic right to make decisions in the best interests of our country.”

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The department concluded its statement by saying its goal is not to “manage” migration, but to “foster remigration.”

In a thread on X also announcing the move to object to the declaration, the department said UN agencies “systematically facilitated mass migration into America and Europe, even as citizens of these nations called for restrictions on migration.” It added that U.N. materials related to the Global Compact call for expanding regular migration pathways and reference “regularization” of migrants.

The International Organization for Migration says the forum is held every four years for countries to review progress and shape next steps on migration policy. IOM, which coordinates the U.N. Network on Migration, says the network includes 39 U.N. agencies working to support countries on migration issues.

The department alleged that “UN agencies – working with the NGOs they fund – established a migration corridor through Central America and to the U.S. border,” the post reads. “As the American people suffered under an unprecedented wave of mass migration, the UN was on the ground pipelining migrants to our southern border.”

The State Department said its goal is not to “manage” migration, but to “foster remigration.” (Denis Balibouse/File Photo/Reuters)

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“After facilitating mass migration to the United States, UN agencies condemned the deportation of illegal immigrants,” the post continued. “While the United Kingdom faced unprecedented illegal boat crossings, UN agencies condemned plans for deportations. UN officials lobbied aviation regulators to prevent the deportation of migrants – an appalling violation of the UK’s national sovereignty.”

The U.N. Network on Migration describes the compact as “non-legally binding.” A U.N.-hosted text of the compact also says it respects states’ sovereign right to determine their national migration policies and to distinguish between regular and irregular migration status.

The declaration itself says the Global Compact is a cooperative framework and acknowledges that no state can address migration alone, while also upholding the sovereignty of states.

The department pushed back on the compact’s framing of migration as “safe, orderly and regular.”

“For the citizens of Western nations, mass migration was never safe. It introduced new security threats, imposed financial strains, and undermined the cohesion of our societies,” it wrote.

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“The United States will not legitimize global compacts that enable mass migration into America or Western nations,” the post added.

U.N. materials frame the compact as a cooperative framework for issues that often cross borders, including labor migration, border management, migrant protections and development. U.N. agencies, including the Office of the High Commissioner for Human Rights, describe the IMRF as a state-led review process with participation from relevant stakeholders.

Fox News Digital has reached out to the U.N. for comment.

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Bolivia issues warrant for Evo Morales’s arrest after court no-show

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Bolivia issues warrant for Evo Morales’s arrest after court no-show

The ex-Bolivian president is on trial for allegedly fathering a child with a 15-year-old girl while in office.

A Bolivian judge has found former President Evo Morales in contempt of court and reissued a warrant for his arrest after he failed to turn up for the start of his trial on charges of trafficking a minor.

The ruling on Monday renewed tensions in the South American country, with supporters of Morales warning they would “throw the country into turmoil” if the former leader is arrested.

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Morales, who is Bolivia’s first Indigenous president, is accused of fathering a child with a 15-year-old girl while in office. The parents of the teen are accused of consenting to the relationship in exchange for favours from Morales.

The former socialist leader, who governed from 2006 to 2019, has rejected the accusations.

Morales did not attend the scheduled start of his trial on Monday in the southern city of Tarija, forcing the proceedings to be suspended.

The Public Prosecutor’s Office said Morales’s “unjustified absence” confirmed his fugitive status and warranted an arrest order as well as a travel ban.

The former president has been hiding from the law in his central coca-growing stronghold of Chapare since late 2024, guarded by Indigenous supporters who have promised to resist any attempt to capture him.

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‘Ready for battle’

“They think that by arresting Evo Morales, they will succeed in quelling and demobilising the movement. They are very much mistaken,” supporter Dieter Mendoza said on Kawsachun Coca radio on Monday. “If they touch Evo Morales, this will cause an upheaval … There will be an insurgency across Bolivia.”

Mendoza urged residents of the Cochabamba Tropics to remain on “high alert” and “ready for battle”.

Authorities first issued an arrest warrant for Morales in October 2024, but could not execute it after his supporters blocked roads for 24 days, preventing officers from reaching the region where he remains sheltered.

Morales was already declared in contempt of court in January 2025, when he did not show for a pretrial detention hearing.

Wilfredo Chavez, one of his lawyers, told the AFP news agency on Friday that neither Morales nor his lawyers would show up in court, as they had not been “properly notified”.  The lawyer said the court did not send the summons to Morales’s address, but had instead served it through an edict.

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Morales, who rose from dire poverty to become one of Latin America’s longest-serving leaders, has slammed those “that persecute me and condemn me in record time”.

His refusal to give up power in 2019 after three terms led to a tumultuous exit that cast a shadow over nearly 14 years of economic progress and poverty reduction.

Forced to resign after elections tainted by fraud, he slipped away into exile in Mexico and later Argentina, but returned home a year later.

He failed to make a comeback last year after being barred from seeking a fourth term in presidential elections.

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