RAINFOREST INFORMATION

A Place Out of Time: Tropical Rainforests and the Perils They Face - information on tropical forests, deforestation, and biodiversity

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BACKGROUND INFORMATION ON THE RAINFOREST

Rainforests are forest ecosystems characterized by high levels of rainfall, an enclosed canopy and high species diversity. While tropical rainforests are the best-known type of rainforest and the focus of this section of the web site, rainforests are actually found widely around the world, including temperate regions in Canada, the United States, and the former Soviet Union.

Tropical rainforests typically occur in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn, latitudes that have warm temperatures and relatively constant year-round sunlight. Tropical rainforests merge into other types of forest depending on the altitude, latitude, and various soil, flooding, and climate conditions. These forest types form a mosaic of vegetation types which contribute to the incredible diversity of the tropics.

The bulk of the world's tropical rainforest occurs in the Amazon Basin in South America. The Congo Basin and Southeast Asia, respectively, have the second and third largest areas of tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, in Madagascar, in West and East Africa outside the Congo Basin, in Central America and Mexico, and in parts of South America outside the Amazon. Brazil has the largest extent of rainforest of any country on Earth.

Rainforests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and Indigenous people. Rainforests are also the source of many useful products upon which local communities depend.

While rainforests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rainforest conversion, but today industrial agriculture — especially monoculture and livestock production — is the dominant driver of rainforest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.

Organization of this site

The rainforest section of Mongabay is divided into ten "chapters" (the original text for the site was a book, but has since been adapted for the web), with add-on content in the form of special focal sections (e.g. The Amazon, the Congo, REDD, New Guinea, Sulawesi, Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers at kids.mongabay.com.

ABOUT THE RAINFOREST (SUMMARY)

RAINFOREST DISTRIBUTION AND CHARACTERISTICS

Each rainforest is unique, but there are certain features common to all tropical rainforests.

• Location: rainforests lie in the tropics.
• Rainfall: rainforests receive at least 80 inches (200 cm) of rain per year.
• Canopy: rainforests have a canopy, which is the layer of branches and leaves formed by closely spaced rainforest trees some 30 meters (100 feet) off the ground. A large proportion of the plants and animals in the rainforest live in the canopy.
• Biodiversity: rainforests have extraordinarily highs level of biological diversity or “biodiversity”. Scientists estimate that about half of Earth's terrestrial species live in rainforests.
• Ecosystem services: rainforests provide a critical ecosystem services at local, regional, and global scales, including producing oxygen (tropical forests are responsible for 25-30 percent of the world's oxygen turnover) and storing carbon (tropical forests store an estimated 229-247 billion tons of carbon) through photosynthesis; influencing precipitation patterns and weather; moderating flood and drought cycles; and facilitating nutrient cycling; among others.

The global distribution of tropical rainforests can be broken up into four biogeographical realms based roughly on four forested continental regions: the Afrotropical, the Australiasian, the Indomalayan/Asian, and the Neotropical. Just over half the world's rainforests lie in the Neotropical realm, roughly a quarter are in Africa, and a fifth in Asia.

These realms can be further divided into major tropical forest regions based on biodiversity hotspots, including:

1. Amazon: Includes parts of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela
2. Congo: Includes parts of Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of Congo
3. Australiasia: Includes parts of Australia, Indonesian half of New Guinea, Papua New Guinea
4. Sundaland: Includes parts of Brunei, Indonesia, Malaysia, Singapore
5. Indo-Burma: Includes parts of Bangladesh, Cambodia, China, India, Laos, Myanmar, Thailand, Vietnam
6. Mesoamerica: Includes parts of Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama
7. Wallacea: Sulawesi and the Maluku islands in Indonesia
8. West Africa: Includes parts of Benin, Cameroon, Côte d'Ivoire, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Togo
9. Atlantic forest: Includes parts of Argentina, Brazil, Paraguay
10. Choco: Includes parts of Colombia, Ecuador, Panama

Other countries that have large areas of rainforest include Bolivia, Cameroon, Central African Republic, Ecuador, Gabon, Guyana, India, Laos, Malaysia, Mexico, Myanmar, Papua New Guinea, Republic of Congo, Suriname, and Venezuela.

Cover and loss by rainforest region

RAINFOREST STRUCTURE

Rainforests are characterized by a unique vegetative structure consisting of several vertical layers including the overstory, canopy, understory, shrub layer, and ground level. The canopy refers to the dense ceiling of leaves and tree branches formed by closely spaced forest trees. The upper canopy is 100-130 feet above the forest floor, penetrated by scattered emergent trees, 130 feet or higher, that make up the level known as the overstory. Below the canopy ceiling are multiple leaf and branch levels known collectively as the understory. The lowest part of the understory, 5-20 feet (1.5-6 meters) above the floor, is known as the shrub layer, made up of shrubby plants and tree saplings.

RAINFOREST BIODIVERSITY

Tropical rainforests support the greatest diversity of living organisms on Earth. Although they cover less than 2 percent of Earth’s surface, rainforests house more than 50 percent of the plants and animals on the planet.

THE RAINFOREST CANOPY

In the rainforest most plant and animal life is not found on the forest floor, but in the leafy world known as the canopy. The canopy, which may be over 100 feet (30 m) above the ground, is made up of the overlapping branches and leaves of rainforest trees. Scientists estimate that more than half of life in the rainforest is found in the trees, making this the richest habitat for plant and animal life.

The conditions of the canopy are markedly different from the conditions of the forest floor. During the day, the canopy is drier and hotter than other parts of the forest, and the plants and animals that live there have adapted accordingly. For example, because the amount of leaves in the canopy can make it difficult to see more than a few feet, many canopy animals rely on loud calls or lyrical songs for communication. Gaps between trees mean that some canopy animals fly, glide, or jump to move about in the treetops. Meanwhile plants have evolved water-retention mechanisms like waxy leaves.

Scientists have long been interested in studying the canopy, but the height of trees made research difficult until recently. Today the canopy is commonly accessed using climbing gear, rope bridges, ladders, and towers. Researchers are even using model airplanes and quadcopters outfitted with special sensors — conservation drones — to study the canopy.

The rainforest floor

The rainforest floor is often dark and humid due to constant shade from the leaves of canopy trees. The canopy not only blocks out sunlight, but dampens wind and rain, and limits shrub growth.

Despite its constant shade, the ground floor of the rainforest is the site for important interactions and complex relationships. The forest floor is one of the principal sites of decomposition, a process paramount for the continuance of the forest as a whole. It provides support for trees responsible for the formation of the canopy and is also home to some of the rainforest's best-known species, including gorillas, tigers, tapirs, and elephants, among others.

Rainforest waters

Tropical rainforests support some of the largest rivers in the world, like the Amazon, Mekong, Negro, Orinoco, and Congo. These mega-rivers are fed by countless smaller tributaries, streams, and creeks. For example, the Amazon alone has some 1,100 tributaries, 17 of which are over 1,000 miles long. Although large tropical rivers are fairly uniform in appearance and water composition, their tributaries vary greatly.

Rainforest waters are home to a wealth of wildlife that is nearly as diverse as the biota on land. For example, more than 5,600 species of fish have been identified in the Amazon Basin alone.

But like rainforests, tropical ecosystems are also threatened. Dams, deforestation, channelization and dredging, pollution, mining, and overfishing are chief dangers.

Rainforest people

Tropical rainforests have long been home to tribal peoples who rely on their surroundings for food, shelter, and medicines. Today very few forest people live in traditional ways; most have been displaced by outside settlers, have been forced to give up their lifestyles by governments, or have chosen to adopt outside customs.

Of the remaining forest people, the Amazon supports the largest number of Indigenous people living in traditional ways, although these people, too, have been impacted by the modern world. Nonetheless, Indigenous peoples' knowledge of medicinal plants remains unmatched and they have a great understanding of the ecology of the Amazon rainforest.

In Africa there are native forest dwellers sometimes known as pygmies. The tallest of these people, also called the Mbuti, rarely exceed 5 feet in height. Their small size enables them to move about the forest more efficiently than taller people.

There are few forest peoples in Asia living in fully traditional ways. The last nomadic people in Borneo are thought to have settled in the late 2000's. New Guinea and the Andaman Islands are generally viewed as the last frontiers for forest people in Asia and the Pacific.

Deforestation

In recent decades there has been an important shift in deforestation trends. Today export-driven industries are driving a bigger share of deforestation than ever before, marking a shift from previous decades, when most tropical deforestation was the product of poor farmers trying to put food on the table for their families. There are important implications from this change. While companies have a greater capacity to chop down forests than small farmers, they are more sensitive to pressure from environmentalists. Thus in recent years, it has become easier—and more ethical—for green groups to go after corporations than after poor farmers.

Rainforests are also threatened by climate change, which is contributing to droughts in parts of the Amazon and Southeast Asia. Drought causes die-offs of trees and dries out leaf litter, increasing the risk of forest fires, which are often set by land developers, ranchers, plantation owners, and loggers.

Rainforest importance

While rainforests may seem like a distant concern, they are critically important for our well-being. Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and producing oxygen, upon which all animals depend for survival. Rainforests also stabilize climate, house incredible amounts of plants and wildlife, and produce nourishing rainfall all around the planet.

Rainforests:

• Help stabilize the world’s climate: Rainforests help stabilize the world’s climate by absorbing carbon dioxide from the atmosphere. Scientists have shown that excess carbon dioxide in the atmosphere from human activities is contributing to climate change. Therefore, living rainforests have an important role in mitigating climate change, but when rainforests are chopped down and burned, the carbon stored in their wood and leaves is released into the atmosphere, contributing to climate change.
• Provide a home to many plants and animals: Rainforests are home to a large number of the world’s plant and animals species, including many endangered species. As forests are cut down, many species are doomed to extinction.
• Help maintain the water cycle: The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. Rainforests also have a role in global weather patterns. For example researchers have shown that forests in South America affect rainfall in the United States, while forests in Southeast Asia influence rain patterns in southeastern Europe and China. Distant rainforests are therefore important to farmers everywhere.
• Protect against flood, drought, and erosion: Rainforests have been compared to natural sponges, moderating flood and drought cycles by slowing run-off and contributing moisture to the local atmosphere. Rainforests are also important in reducing soil erosion by anchoring the ground with their roots. When trees are cut down there is no longer anything to protect the ground, and soils are quickly washed away with rain. On steep hillsides, loss of forest can trigger landslides.
• Are a source for medicines and foods and support forest-dependent people: People have long used forests as a source of food, wood, medicine, and recreation. When forests are lost, they can no longer provide these resources. Instead people must find other places to get these goods and services. They also must find ways to pay for the things they once got for free from the forest.

Rainforest conservation

Rainforests are disappearing very quickly. The good news is there are a lot of people who want to save rainforests. The bad news is that saving rainforests will be a challenge as it means humanity will need to shift away from business-as-usual practices by developing new policies and economic measures to creative incentives for preserving forests as healthy and productive ecosystems.

Over the past decade there has been considerable progress on several conservation fronts. Policymakers and companies are increasingly valuing rainforests for the services they afford, setting aside large blocks of forests in protected areas and setting up new financial mechanisms that compensate communities, state and local governments, and countries for conserving forests. Meanwhile, forest-dependent people are gaining more management control over the forests they have long stewarded. Large international companies are finally establishing policies that exclude materials sourced via deforestation. People are abandoning rural areas, leading to forest recovery in some planes.

But the battle is far from over. Growing population and consumption means that rainforests will continue to face intense pressures. At the same time, climate change threatens to dramatically alter temperatures and precipitation patterns, potentially pushing some forests toward critical tipping points.

Thus the future of the world's rainforests in very much in our hands. The actions we take in the next 20 years will determine whether rainforests, as we currently know them, are around to sustain and nourish future generations of people and wildlife.

The Latest News on Rainforests

Study finds microplastics in tadpoles in the Amazon for the first time (May 5 2026)
Researchers have recorded microplastics in frog tadpoles and their pond habitats in the wild in the Amazon for the first time, according to a new study. This confirms widespread microplastic contamination in the Amazon Rainforest, the researchers say.   Previous studies from the region have found microplastic contamination in fish, invertebrates, soil and water samples. […]

Declining Australian tree health is as big a problem as bushfires (commentary) (May 5 2026)
- Unlike destructive bushfires, tree health is often treated as a niche or technical issue, but its implications pose equally important questions about ecological resilience and public health, a new op-ed argues.
- Threats to Australian tree species are multiplying like an invisible bushfire via a proliferation of introduced insects and pathogens, the author suggests, ahead of his country’s first national forum on the topic later this month, Safeguarding Australia’s Tree Health, in Brisbane.
- “We recognize bushfires as a national crisis because their impacts are visible and immediate, but some ecological crises arrive more quietly. If we fail to notice them early, the damage can become harder to reverse for forests, for biodiversity, and for the communities that depend on them,” he writes.
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Can listening to a forest reveal whether it is ecologically healthy? (May 4 2026)
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. Researchers have been using sound to study ecosystems for years. A study from ETH Zürich uses it to examine Costa Rica’s payment for ecosystem services program, reports Mongabay’s Abhishyant Kidangoor. Giacomo Delgado, a doctoral researcher, compares the method […]

Solar installation and deforestation in the Amazon: Photo of the week (May 4 2026)
In August 2025, photojournalist Victor Moriyama captured this scene on the outskirts of Rio Branco, the capital of Acre, a state in the far northwest of the Brazilian Amazon. As a row of trucks in the background carries piles of wood freshly logged from the rainforest, employees of Primaz Energia Solar, a local solar energy […]

In Guatemala, new AI technology will be ‘listening’ for illegal deforestation (Apr 30 2026)
- A new project in Guatemala’s Maya Biosphere Reserve will install bioacoustics devices that can “listen” for illegal activity, using AI models trained to identify chainsaws, gunshots and other sounds associated with environmental crime.
- The project is part of the $100 million AI for Climate and Nature Grand Challenge, run by the Bezos Earth Fund for innovative uses of artificial intelligence for tackling biodiversity loss, climate change and food insecurity.
- The devices will be installed in parts of the reserve threatened by cattle ranching and illegal human settlements, accounting for thousands of hectares of annual forest loss in recent years.
- If successful, bioacoustics technology could be combined with camera traps, drone monitoring, satellite data and human observation to create a more efficient and data-driven conservation strategy, members of the project said.

Endangered Javan gibbon baby born in UK rare species sanctuary (Apr 30 2026)
A rare Javan gibbon was born at a wildlife park in the U.K., one of the world’s main centers for the species’ captive breeding. Lima, now just over 2 months old, is a potential candidate for returning to the species’ native habitat on the Indonesian island of Java. The Javan gibbon (Hylobates moloch), known locally […]

A “good year” for forests changes less than it seems (Apr 29 2026)
- Tropical primary forest loss saw a significant drop in 2025, but the decline likely represents a temporary reprieve driven by favorable weather rather than a fundamental shift in the root causes of deforestation.
- The reduction was largely due to a decrease in fire-related losses following the extreme droughts of 2024, highlighting how forest health is increasingly dictated by climate variability and rainfall extremes.
- While policy-driven successes in Brazil and Indonesia offer a blueprint for enforcement, these gains remain fragile and vulnerable to shifting political dynamics and weakening governance.
- The resilience of recent progress faces an imminent test in 2026, as forecasts for a returning El Niño threaten to bring back the dry conditions that historically trigger catastrophic forest loss.

Brazilian state greenlights deforestation for contested open-pit gold mine (Apr 29 2026)
The state of Pará in the Brazilian Amazon has authorized Canadian mining company Belo Sun to begin clearing nearly 600 hectares, or almost 1,500 acres, of rainforest for an open-pit gold mine. Legal experts say it’s premature to clear a forest the size of 840 soccer fields while key aspects of the project remain unresolved.  […]

Angola’s highest mountain and its unique wildlife are now protected (Apr 29 2026)
Angola has declared its highest mountain, Mount Moco, part of a new conservation area to protect its threatened Afromontane forests. The Serra do Moco Conservation Area, which includes a complex of elevations, slopes and valleys in the municipality of Londuimbali, Huambo province, will now be under “a special regime of environmental protection, biodiversity conservation, and […]

Tropical forest loss falls in 2025, but world still off track on deforestation goals (Apr 29 2026)
- Tropical primary forest loss fell sharply in 2025, down 36% from 2024, but the decline may reflect fewer fires rather than sustained progress.
- Despite the drop, the world still lost an area of tropical primary forest larger than Switzerland last year, leaving countries far off track from their 2030 goal of ending deforestation.
- Smaller forest-rich countries are losing remaining forests fastest, while major forest nations like Brazil show gains linked to stronger enforcement.
- Climate-driven fires, weak governance and commodity pressures continue to drive forest loss, making recent gains fragile and uncertain.

Why forest conservation is also public health (Apr 22 2026)
- A new study from Madagascar provides the first complete mitochondrial genomes for two endemic tuft-tailed rats, offering a clearer baseline for identifying and tracking native rodent species.
- Fieldwork found these native rodents only in intact forest, while degraded areas were dominated by invasive black rats, suggesting a shift in community composition linked to habitat change.
- Understanding which rodent species are present, where they live, and how their populations change is critical not just for biodiversity, but for identifying how pathogen dynamics may shift across landscapes.
- The research illustrates how improved ecological monitoring can connect conservation and public health, supporting the view that protecting ecosystems and managing disease risk are closely linked.

Vaupés River contamination identified near rapidly expanding Amazonian town (Apr 21 2026)
- Indigenous people who live downstream from a rapidly expanding Amazonian town on the banks of the Vaupés River told Mongabay the river is contaminated by sewage and has made people sick.
- To verify this, Mongabay obtained water quality studies from the Corporation for Sustainable Development of the Northern and Eastern Amazon, which confirmed that sewage contamination and organic load are above safe limits and may impact public health and the quality of the aquatic ecosystem.
- Traditionally, the Macaquiño community downstream considers the Vaupés River to be a living being with whom they coexist and depend on it for bathing, fishing and human consumption.
- Public authorities in Mitú said the contamination stems in part from the municipality’s poorly constructed wastewater treatment plant, which was built on a flood zone and therefore frequently collapses, dumping untreated sewage into the river.

Studying the world’s largest gathering of forest elephants with sound and field observation (Apr 19 2026)
- At Dzanga Bai in the Central African Republic—one of the few places where forest elephants gather in large numbers—researchers can observe behaviors that are otherwise difficult to document in dense rainforest.
- Ivonne Kienast leads long-term research combining direct observation with acoustic monitoring, building a detailed record of elephant behavior, social structure, and change over time.
- Her work highlights how sustained presence, local collaboration, and incremental data collection shape understanding of both elephants and the broader forest system they inhabit.
- Kienast spoke with Rhett Ayers Butler, Mongabay founder and CEO, and David Akana, director of Mongabay Africa, over two weeks of conversations in the Central African Republic and the Democratic Republic of the Congo during March 2026. Her responses have been edited and consolidated.

Rehab center opens for Brazil’s golden-headed lion tamarins amid urban sprawl threat (Apr 17 2026)
Brazil has opened its first rehabilitation center for golden-headed lion tamarins, an endangered monkey species threatened by urban expansion and the loss of agroforestry farms to monocrop plantations. The tamarins, Leontopithecus chrysomelas, have been filmed in and around Ilhéus, a coastal city in Bahia state, eating fruit inside a supermarket or running across high-voltage electricity […]

10 forces that could reshape the future of the world’s forests (Apr 16 2026)
- A new horizon scan identifies ten emerging forces—spanning politics, finance and technology—that are likely to shape forests over the next decade, increasing uncertainty for ecosystems and the people who depend on them.
- Traditional funding for conservation is weakening as public aid declines, while new mechanisms—from carbon markets to direct financing for Indigenous and local communities—are expanding unevenly.
- Advances in remote sensing, AI and connectivity are improving monitoring and accountability, but are also enabling illegal activities and accelerating pressures in some regions.
- Growing demand for critical minerals, shifting trade rules and tighter political control over civil society are reshaping forest governance, fragmenting authority and redistributing risks and benefits.