At least 20 endangered Ganges river dolphins still survive in Bangladesh’s extremely polluted Buriganga River, a 12-month study found, reports contributor Md Jahidul Islam for Mongabay. Skirting the southern edge of the country’s capital, Dhaka, the 29-kilometer (18-mile) river is recognized as one of the most contaminated urban waterways globally. Researchers surveyed a 27-km (16.7-mi) stretch of the river between September 2023 and August 2024, observing Ganges river dolphins (Platanista gangetica) in 10 out of the 12 survey months. Group sizes averaged about four individuals, with calves accounting for nearly 16% of sightings, signaling active reproduction despite severe ecological degradation. “The Buriganga is not a usual place for dolphins, where native fishes have largely vanished,” study co-author and researcher Md. Aminur Rahman told Mongabay. “When we found [the dolphins], we were amazed at how it was possible. Because the river is not livable for fish.” A 2025 study on the Buriganga River’s water pollution showed that it absorbs untreated industrial effluent from tanneries, textile dyeing plants, battery factories, and municipal sewage. Levels of toxic heavy metals, including lead, chromium, and cadmium, routinely exceed World Health Organization safety limits, driving dissolved oxygen levels near zero during the dry season, the study reads. While native fish species have collapsed, pollution-tolerant invasive suckermouth catfish (Hypostomus plecostomus), native to South America, have multiplied rapidly, Rahman said. Mohammad Abdul Aziz, study co-author and zoology professor at Jahangirnagar University in Dhaka, told Mongabay that the dolphins have likely adapted their diet to survive on these invasive…This article was originally published on Mongabay

Central Tokyo has experienced 35 consecutive days of rainfall, setting the longest continuous rainy streak since records began in 1886, reported local media citing Japan’s weather agency. Rains began on Aug. 27 and have continued daily as of Sept. 30. This spell breaks the previous record of 33 consecutive days of rainfall set in 2019, from June 27-July 29, according to Tokyo-based news site Japan Today. Tokyo typically sees its rainiest period in June-July. The nonstop rains in September are due to a combination of a stationary autumn rain front (known locally as akisame-zensen), intensified by approaching typhoons, including Typhoon Dujuan and low-pressure troughs. Rainfall in central Tokyo in September reached 629 millimeters (24.8 inches) by Sept. 28 — nearly three times the typical monthly average and approaching the September record of 670.9 mm (26.4 in) set in 1958, according to local media. Another typhoon is expected to affect Tokyo by Oct. 1. Meteorological officials attribute the abnormal weather pattern in part to global climate drivers, including El Niño, the warming of surface ocean temperatures in the tropical Pacific. Masayuki Kyoda, an official at the Japan Meteorological Agency (JMA), told AFP that “the distinctive weather map during this month is in part because of El Niño.” “Autumn rain fronts are staying longer than usual,” Kyoda said, because an associated Pacific high-pressure system has remained prolonged over the region. While he noted that it’s difficult to attribute a single event directly to climate change, a JMA report, “Climate Change in Japan…This article was originally published on Mongabay

The World Health Organization has officially recognized Bhutan for eliminating dog-transmitted human rabies as a public health problem  — in time for World Rabies Day on Sept. 28. According to the World Health Organization (WHO), Bhutan is the first country in the Southeast Asia region, and the second to be named globally after Mexico, to achieve this validation. Nearly 99% of all human rabies cases globally are caused by the bite or scratch of an infected dog. Once symptoms appear, rabies is almost always fatal. On Sept. 4, the WHO confirmed that Bhutan has recorded zero human deaths from dog-mediated rabies since June 2023 and has demonstrated that it has the resources and systems in place to prevent the disease’s re-emergence. Bhutan’s achievement comes as organizations including the WHO, World Organisation for Animal Health (WOAH), Food and Agriculture Organization of the United Nations (FAO) and Global Alliance for Rabies Control (GARC) mark World Rabies Day with the theme of “Stronger Together”, advancing a global goal to eliminate human rabies deaths worldwide by 2030 under the “Zero by 30” initiative. To eradicate rabies, Bhutan has persistently invested in a comprehensive “One Health” approach, which recognizes that animal, human and environmental health are interconnected, the WHO said in a press release. A 2021 Royal Decree by the King of Bhutan launched the Nationwide Accelerated Dog Population Mangement and Rabies Control Programme, implemented jointly by the Ministry of Health and Ministry of Agriculture and Livestock. WHO said field health teams and veterinarians supported by…This article was originally published on Mongabay

A giant octopus devouring a jellyfish. An ultra-fast gossamer worm. These are just a couple of the 31 new species scientists discovered on a recent expedition off the coast of Brazil. They explored the ocean’s midwater zone — the vast space between the sunlit surface and the seafloor — which is the Earth’s largest and least explored habitable ecosystem. While it can take researchers decades to identify and describe new species, state-of-the-art technology like 3D lasers and advanced microscopes helped the team confirm these new species within a matter of days.This article was originally published on Mongabay

The Philippines remains the deadliest country in Asia for land and environmental defenders, according to a new report by the non-profit Global Witness. In its report, Global Witness says it could verify the killings  of 124 land and environmental defenders worldwide in 2025. While the majority, 85% of cases, occurred in Latin America, Asia accounted for 12% of the deaths with 12 defenders killed in the Philippines and one person killed for each of India, Indonesia and Turkey. The Philippines remains the deadliest country in Asia for the thirteenth consecutive year. Its 12 documented cases in 2025 represent the highest total recorded in any single country outside Latin America, the report says. State forces played a central role in the violence against environmental and land defenders in the country, with the Philippine military suspected of participating in five of the 12 killings amid expanded rural counterinsurgency campaigns and resource extraction projects, according to the report. “The report adds an important dimension to what we already know about the situation of land and environmental defenders in the Philippines,” Manila-based environmental advocacy group Kalikasan People’s Network for the Environment (PNE) told Mongabay in an emailed statement. “Attacks against defenders are entrenched in state policies and structures that facilitate extractive and development projects.” Global Witness’ report adds that killings “are only the most extreme form of reprisal that defenders face.” Beyond lethal violence, environmental defenders  face a rising tide of legal harassment, criminalization, and smear campaigns, it says. In the Philippines, for example, the…This article was originally published on Mongabay