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