A mushroom is analogous to a flower on a plant — it’s the reproductive organ of a fungus, which protects and distributes fungal spores. Mushrooms are critical part of our ecosystems. For humans and other animals, mushrooms are also food. And they may be part of the solution for food security and solving the plastic crisis. On Oct. 15, World Mushroom Day, we highlight three such stories that Mongabay has covered. Mushrooms can help inspire eco-friendly solutions to problems Mushrooms are helping us create low-cost, sustainable housing materials and additional income for farmers, according to Gabriela D’Elia, director of the Fungal Diversity Survey. In a Mongabay video titled “Fungi are our climate allies” published last year, D’Elia cited examples of projects that are using mushrooms to address food security and waste management. For example, a company called Evocative uses a mushroom called artist’s conk (Ganoderma applanatum) to create materials that can possibly replace leather, plastic, and other packaging materials, D’Elia said. “Fungi are showing us new ways to live in allyship with the planet,” D’Elia added. Golden oyster mushrooms are crowding out native fungi in North America Golden oyster mushrooms, known for their bright yellow caps and earthy flavors, are prized edible mushrooms. They’re native to Asia, but have gained popularity throughout North America, where they’re spreading across forests and displacing native fungal species, a 2025 study found. Aishwarya Veerabahu, lead author and a doctoral student at the University of Wisconsin-Madison, U.S., told Mongabay’s Shreya Dasgupta that the study was prompted by…This article was originally published on Mongabay

The Klamath River in the U.S. was heavily dammed over the 20th century, blocking spawning Chinook salmon. As a result, the population of salmon that spawned in the river, which runs through Southern Oregon and Northern California, declined by roughly 90%. However, a recent study found that removing the dams resulted in a quick return of the fish to the river. In 2024, four dams were removed from the Klamath, allowing Chinook salmon (Oncorhynchus tshawytscha) to recolonize habitat that had been unavailable to them for roughly a century. Shortly after the dams were removed, 7,742 Chinook salmon migrated up the Klamath River past the former dams. In 2025, that number jumped to more than 13,000. The fish expanded into 345 kilometers (214 miles) of formerly blocked river, recolonizing 88% of their known historical habitat, the study found. First author of the study Damon Goodman told Mongabay in an email that they expected the Chinook to return to the river but didn’t know how long it would take. “What surprised us was the speed and scale of their response – it felt like we were running to keep up with the fish! These fish navigated challenging rapids, engineered fishways, and a large lake to reach habitats that had been inaccessible for more than a century.” Goodman and colleagues employed a specialized underwater sonar camera that uses sound waves instead of light to produce moving images of fish swimming through the river. “Think of it as an underwater video camera that can…This article was originally published on Mongabay

Happy World Octopus Day!  Every Oct 8, the world celebrates one of the more unusual creatures of the sea. Octopuses are well-known for their eight legs and ability to squirt ink when frightened. They’ve also been known to use tools, a sign of intelligence, and can shape-shift to mimic the colors and texture of their surroundings, an effective way to disappear from both predators and prey. Mongabay has reported on several octopus discoveries this year, including: Ancient octopus were apex predators Modern colossal squid are believed to be the largest invertebrates in the sea, but Mongabay’s Shanna Hanbury recently reported on an even larger ancient octopus species whose fossils were described by Japanese researchers in April 2026. The Japanese team found a fossilized jawbone from the now-extinct Nanaimoteuthis haggarti. Based on its jaw size, researchers suggest the octopus may have reached 6.6 to 18.6 meters (22 to 61 feet) in length. On the higher end, that’s around two-thirds the size of an adult blue whale, the largest animal to ever exist. “It suggests that it may have been among the largest invertebrates ever known,” study co-author Yasuhiro Iba, a paleontologist at Hokkaido University in Japan, told Mongabay by email. They were likely gigantic predators that roamed the late Cretaceous seas between 100 million to 72 million years ago. A rare look at baby octopuses From long dead octopus to newly born, Hanbury also reported on baby Argentine octopuses and a rare photo of them. Patagonian octopus eggs in Puerto Lobos Protected…This article was originally published on Mongabay

In Africa, high-quality seeds can produce improved crops with enhanced nutrition, pest-resistance, and drought tolerance. However, such seeds for maize, vegetables, and cereal crops can be indistinguishable from counterfeit, or “fake” seeds. That’s creating a massive potential for fraud in seed quality that can potentially deprive farmers of access to climate-resilient seeds while putting their harvests and incomes at risk. A group of researchers analyzed the efforts of 50 African countries to combat counterfeit seeds. They found a wide range of penalties for selling them across different governments, and concluded that a significant gap exists between government policy commitments and implementation, largely due to limited capacity. Study lead author Ed Mabaya, a professor of global development at Cornell University in the U.S., told Mongabay, “For most smallholder farmers in Africa, planting happens once a season, often timed to the first rains. A farmer who buys counterfeit seed usually finds out only after planting, when the seed fails to germinate or the crop grows poorly. By then it is usually too late to replant, so the loss is not a slightly smaller harvest but potentially the whole season’s food and income.” That can lead to food insecurity for the individual farmer and local markets more broadly. Counterfeiters can dye or repackage grain and sell it as branded, certified seed, Mabaya said. “The problem arises because certified seed looks exactly like ordinary grain but sells for a much higher price, in some cases several times more for hybrid maize. That price gap…This article was originally published on Mongabay

Giraffes living in the South Sudan’s war-torn savannas are genetically healthy and connected to nearby giraffe populations by gene flow, despite decades of conflict, recent research suggests. These findings show that “regions of the world that have been affected by conflict can maintain a lot of biodiversity and should therefore not be overlooked by genetic studies and conservation efforts,” Sam van Giessen, study lead author and a conservation genomics researcher from the University of Amsterdam, Netherlands, told Mongabay by email. The IUCN, the global wildlife conservation authority, currently recognizes four species and seven subspecies of giraffes. South Sudan is home to two subspecies of the critically endangered northern giraffe (Giraffa camelopardalis): the Nubian giraffe (G. c. camelopardalis) and the Kordofan giraffe (G. c. antiquorum). Between the conflict years of 1985 and 2025, Nubian giraffes in Ethiopia and South Sudan declined by 95%. By 2025, researchers estimated roughly 235 Nubian giraffe survived across South Sudan in isolated pockets, down from an estimate of 15,000 individuals in 1995. To find out the genetic health of these giraffe populations, researchers from the South Sudan government, the Giraffe Conservation Foundation (GCF), and conservation NGO African Parks analyzed DNA from skin biopsies collected from 30 Nubian giraffes in Boma and Badingilo national parks, run by African Parks. As the giraffe population in the region is small, there was some concern that inbreeding could be a problem for the subspecies’ long-term conservation. However, their analysis showed the South Sudan Nubian giraffe population has relatively high levels…This article was originally published on Mongabay

Plastic pollution could disrupt the bioluminescent light produced by deep-sea organisms, researchers warn in a letter in the journal Cambridge Prisms: Plastics. When deep-sea organisms ingest plastics, it could disrupt the chemical pathways that create bioluminescence and damage the tissues in their bodies, impairing their ability to find food and a mate, the authors said. In the deep sea, up to 80% of organisms with complex cells are believed to be bioluminescent, the only source of light in the darkest parts of the ocean. The light these organisms create is essential for their survival and reproduction, the letter notes. Disruption of their bioluminescence could negatively impact food webs and ecosystem functions in the deep sea, the largest and least-explored biome on Earth, the letter says. In an email to Mongabay, co-author Renjith VishnuRadhan of Amity University in India offered the example of an anglerfish. “It is widely recognizable from documentaries and films such as Finding Nemo,” he said. “Female deep-sea anglerfish have a modified dorsal spine ending in a luminous lure called the esca. Light produced by symbiotic bacteria helps attract prey and may also assist with recognition or communication in darkness.” It’s well-established that bacterial bioluminescence can be affected by pollutants, VishnuRadhan said, and ingestion of toxic plastic additives by anglerfish could disrupt the bacterial symbiosis in the lure, theoretically affecting its luminous signaling. The authors note there’s some evidence of plastic pollution impacts on deep-sea ecosystems, but scientists lack the high-quality data and observations needed to understand the…This article was originally published on Mongabay