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Scientists can teach Crocodiles not to eat invasive toads: Dr. Ruchira Somaweera

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Wild crocodiles can be trained to avoid eating invasive species — a breakthrough that offers real hope for conservation in a rapidly changing world, according to world-renowned reptile biologist Dr. Ruchira Somaweera, addressing a packed audience at the Wildlife and Nature Protection Society (WNPS) Monthly Lecture, sponsored by Nations Trust Bank (NTB), at the BMICH this week.

Presenting some of the first field-based evidence of learning-driven conservation in Australia, Dr. Somaweera revealed how crocodiles were successfully conditioned to reject toxic cane toads before the invasive species reached their habitats — dramatically improving survival rates.

“This is not theory anymore. This works in the wild,” Dr. Somaweera said.

“We can teach predators in advance not to eat something that will kill them.”

The method, known as conditioned taste aversion, involves exposing crocodiles to small, non-lethal toads that make them sick but allow them to survive. The experience teaches the animal to permanently associate the smell, taste and appearance of the toad with danger.

“When they encounter a toad again, they bite and release it,” he explained. “That single learning event can save their lives.”

Dr. Somaweera said the research — developed over nearly two decades — marks a shift away from traditional conservation approaches that rely on relocation or population control.

“This is creative conservation,” he told the audience. “It’s taking behavioural science and turning it into action.”

He described the challenges of applying the technique in the wild, including designing baiting systems that crocodiles would actually respond to.

“Nothing was straightforward,” he said. “If you put bait on land, everything eats it. If you put it in water, it sinks. Crocodiles also need movement or vibration to strike.”

Custom-built devices developed by his students eventually solved the problem, allowing researchers to train wild crocodiles in isolated waterholes ahead of cane toad invasions. Long-term studies showed that the learning persisted, enabling more crocodiles to survive and reproduce.

Beyond crocodiles, Dr. Somaweera’s lecture highlighted how invasive species, climate change and urbanisation are reshaping animal behaviour, often in unexpected ways.

By Ifham Nizam ✍️



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Heat Index likely to increase up to ‘Caution level’ at some places in the Western, Sabaragamuwa, Southern and North-western provinces and in Monaragala and Mannar districts

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Warm Weather Advisory
Issued by the Natural Hazards Early Warning Centre of the Department of Meteorology at 3.30 p.m. on 12 March 2026, valid for 13 March 2026.

Heat index, the temperature felt on human body is likely to increase up to ‘Caution level’ at some places in Western, Sabaragamuwa, Southern and North-western provinces and in
Monaragala and Mannar districts.

The Heat Index Forecast is calculated by using relative humidity and maximum temperature and this is the condition that is felt on your body. This is not the forecast of maximum temperature. It is generated by the Department of Meteorology for the next day period and prepared by using global numerical weather prediction model data.


Effect of the heat index on human body is mentioned in the above table and it is prepared on
the advice of the Ministry of Health and Indigenous Medical Services.

ACTION REQUIRED
Job sites: Stay hydrated and takes breaks in the shade as often as possible.
Indoors: Check up on the elderly and the sick.
Vehicles: Never leave children unattended.
Outdoors: Limit strenuous outdoor activities, find shade and stay hydrated.
Dress: Wear lightweight and white or light-colored clothing.

Note:
In addition, please refer to advisories issued by the Disaster Preparedness & Response Division, Ministry of Health in this regard as well. For further clarifications please contact 011-7446491.

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Govt. bends rules, lowers coal standards in favour of errant company: FSP

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Pubudu

The Frontline Socialist Party (FSP) yesterday accused the government of trying to award another tender to the Indian company that supplied low-grade coal to the Norochcholai Power Plant and failed to deliver the stipulated amount of coal according to schedule.

The allegation was made by the Education Secretary of the Progressive Socialist Party, Pubudu Jayagoda, during media briefing at the party office in Nugegoda last afternoon.

Jayagoda said that in September 2025, the government had awarded a tender to the Indian company Trident Chemphar to supply 25 coal shipments for electricity generation in 2026.

In August 2025, it was confirmed that the coal delivered by the company was substandard. The company also failed to supply coal on schedule. Although the first shipment was expected in the second week of December 2025, it arrived at the end of the month. By mid-March, only 12 ships had arrived, and biweekly deliveries have been disrupted, putting Sri Lanka at risk of a severe energy shortage.

On 11 March, the government called a sudden spot tender for five coal shipments. Four companies submitted bids, and they include Trident Chemphar. FSP criticiced awarding the tender to the same discredited company, saying it was unethical and could trigger a major national crisis, as the company had failed to supply quality coal reliably in the past.

Previously, coal quality was strictly measured, with a “Reject Value”. But now to help the errant supplier the term of Reject Value has now been omitted altogether and replaced with a new term ‘Minimum Value’ setting it as the minimum calorific threshold—coal producing less than 5,900 kilocalories per kilogram was rejected, and coal with ash content above 16% was also discarded.

However, the government is now reportedly lowering these standards, accepting substandard coal, and changing tender specifications to accommodate the company.

Jayagoda castigated the latest stunt coming especially at a time when the world faces war and oil shortages. Diesel meant for electricity generation is being diverted to school buses, public transport, and emergency vehicles, leaving households at risk of prolonged blackouts. Even if diesel is imported, electricity tariffs could skyrocket.

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Lanka requests diesel from India

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The Indian Ministry of External Affairs has said it is considering requests for diesel supplies from neighbouring countries, including Sri Lanka, Bangladesh and the Maldives.

Speaking to the Press Trust of India, Ministry Spokesperson Randhir Jaiswal noted that India was a major exporter of refined petroleum products in the region. He confirmed that Bangladesh had formally requested a diesel supply, which is currently under review.

He said that diesel exports to Bangladesh had largely continued since 2017, but any new allocations would take into account India’s refining capacity, domestic demand, and overall fuel availability.

Jaiswal added that similar requests from Sri Lanka and the Maldives were also being considered, with India’s own energy requirements forming a key part of the decision-making process.

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