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

How small actions can become planetary forces (Jun 4 2026)
- Nature’s Echo argues that feedback loops shape everything from the formation of stars and the spread of life to climate change, ecological recovery, and human behavior.
- Crowther is strongest when applying this framework to ecology, showing how forests, food webs, restoration, and resilience depend on the balance between reinforcing and stabilizing forces.
- The book moves from explanation to application, suggesting that restoration succeeds when nature recovery creates tangible benefits that people want to sustain.

Legal protections for Brazil’s isolated Indigenous peoples: Interview with prosecutor Daniel Luís Dalberto (Jun 3 2026)
- Across Brazil, orders known as land-use restrictions serve as temporary protective measures for the territories of recently contacted Indigenous peoples and those living in voluntary isolation.
- But while the measures are meant to allow time for the formal demarcation process to be carried out, they’ve now become an end to themselves, renewed repeatedly and failing to prevent the invasion and exploitation of these lands, says Brazilian federal public prosecutor Daniel Luís Dalberto.
- Dalberto told Mongabay in an interview that the measure is meant to be precautionary and accompanied by other protective measures by government agencies, such as monitoring work and operations to combat crime.
- He also raised concerns about the frequency with which issues affecting Indigenous territories are being raised to the country’s highest court, rather than being resolved at local courts and tribunals, which closes off an important front in the fight for fundamental rights.

Chimpanzees vs. a mega railway (Jun 3 2026)
A massive railway project, The Simandou corridor, in Guinea is cutting through one of West Africa’s most important ecosystems. The Simandou corridor is fragmenting forests that are home to the largest population of endangered western chimpanzees, putting their survival at risk. But why is this massive railway project being built? Deep within Guinea’s forests lie […]

Nature’s feedback loops can drive collapse. Thomas Crowther thinks they can also drive recovery (Jun 1 2026)
- Thomas Crowther’s Nature’s Echo argues that feedback loops shape everything from ecosystems and climate systems to human psychology and social change.
- Drawing on ecology, cosmology, and restoration science, the book reframes conservation as the cultivation of self-reinforcing systems rather than isolated interventions.
- Crowther suggests that optimism, behavior, and narrative are not peripheral to environmental outcomes, but part of the forces that influence them.
- In an interview with Mongabay’s founder and CEO, Crowther discusses how these ideas inform his thinking on restoration, regenerative movements, ecological resilience, and the role individuals play in larger systems of change.

Report alleges élite ties behind logging permits in Cameroon’s Ebo Forest (May 29 2026)
- A report by a Swiss advocacy group says a timber company logging Cameroon’s Ebo Forest is tied to a wider network of political élites in Yaoundé.
- The company, Sextransbois, is part of a network of logging and agriculture interests owned by prominent businessman Aboubakar Al Fatih.
- Corporate registry documents analyzed by the group show that Sextransbois was incorporated by relatives of President Paul Biya’s eldest son before being transferred to Al Fatih’s half-brother in 2014.
- Environmental groups have accused a number of companies owned by or linked to Al Fatih of breaking Cameroonian law.

The Amazon’s path from crisis to durability (May 28 2026)
- Amazon biodiversity protection depends on more than keeping forests standing; a forest can remain on the map while losing ecological function, governance protections, enforcement capacity, or public support.
- Six connected gaps shape Amazon conservation: finance and forest economy, governance, enforcement, forest function, Indigenous rights, and narrative.
- Progress is possible. Brazil has reduced deforestation before, satellite alerts can strengthen enforcement, Indigenous land rights can protect forests, and better finance and monitoring can make protection more durable.
- The central challenge is making the systems around the forest pull in the same direction: finance that favors protection, governance that reduces impunity, enforcement with consequences, rights that hold on the ground, monitoring that reveals what tree cover hides, and stories that show where action is possible.

A ‘symphony’ of wildlife suggests carbon financing is working in Sierra Leone (May 27 2026)
- A study conducted in Sierra Leone’s Gola Rainforest National Park found that the United Nations Reducing Emissions from Deforestation and forest Degradation (REDD+) financing program, set up to ensure that forests sequester carbon, also confers some benefits to the park’s animal biodiversity.
- Compared to a neighboring protected area without REDD+ funding and a bordering community-owned agroforestry area, the national park had higher soundscape saturation, a proxy for biodiversity. However, the authors also found that the agroforestry area had a higher diversity of insects than the two other study areas.
- The study emphasizes that carbon financing programs can provide benefits outside of storing carbon, but experts also highlight that it shows that on-the-ground monitoring can be cheaply, effectively added to programs like REDD+ to help better conserve forests as whole ecosystems.

Luxury yacht maker Sunseeker pleads guilty to violating a US environmental law (May 27 2026)
Luxury yacht manufacturer Sunseeker has pleaded guilty to violating a U.S. environmental law by using illegally sourced teak from Myanmar on two of its yachts imported into the U.S. The U.K.-based Sunseeker International Limited, which describes itself as “the world’s leading brand for luxury motor yachts,” along with its U.S. subsidiary pleaded guilty on May […]

Building bridges for human-wildlife coexistence: Interview with Yap Jo Leen (May 27 2026)
- Conservationist Yap Jo Leen launched the Langur Project Penang after witnessing dusky langurs, an endangered monkey she was studying for her Ph.D. research, getting struck by vehicles on Malaysia’s Penang Island.
- Since 2019, her group has built three canopy bridges made from repurposed fire hoses to help langurs and other tree-dwelling wildlife safely cross busy roads, with no recorded langur roadkill deaths at the first bridge site since its installation.
- The project combines wildlife conservation with citizen science and environmental education, training volunteers to track langur movements, collect ecological and social data, and work with local communities to reduce human-wildlife conflict.
- Yap says the long-term goal is not simply to build more wildlife bridges, but to foster a broader culture of coexistence and community stewardship for urban wildlife across Malaysia.

Amid efforts to save Australia’s southern cassowaries, their numbers remain unknown (May 26 2026)
- The southern cassowary, a rare and elusive rainforest bird that lives along Queensland’s northern coast, once faced extinction. Now, its numbers are stable, but scientists still lack an up-to-date estimate of how many remain.
- Shrinking habitat was a key factor in the bird’s decline, but designation of the northeast coast “Wet Tropics” as a World Heritage Site protected both the ecosystem and the cassowaries that live there.
- As an important seed disperser, this bird helps sustain this rainforest’s plants and trees, but its slow breeding and need for large, connected habitats make it vulnerable.
- Growing threats from road collisions and intensifying cyclones, heat waves and other climate impacts are putting renewed pressure on this bird and increasing urgency for better monitoring and conservation.

Brazil has protected much of the Amazon. It now has to pay for it. (May 26 2026)
- Brazil has built one of the world’s most important protected-area systems, but a new study finds that most federal protected areas remain underfunded, with the largest shortfalls in the Amazon.
- The funding gap reflects more than the size of Brazil’s conservation estate: remote Amazon reserves are costly to manage, politically less visible, and often receive far less support than protected areas near cities and institutions.
- Underfunding has practical consequences, limiting staff, patrols, fire response, monitoring, community engagement, and the ability of protected areas to prevent deforestation and other threats.
- Tourism, ARPA, the Amazon Fund, and rising federal environmental budgets can help, but Brazil needs stable, transparent, long-term financing that matches the recurring cost of turning legal protection into management.

Will my president save the Amazon? (commentary) (May 24 2026)
- Voters in Brazil, Peru, and Colombia will soon choose presidents whose policies could shape the future of roughly 82% of the Amazon rainforest.
- Environmental issues have been largely absent from recent presidential debates, even as droughts, floods, deforestation, illegal mining, and organized crime increasingly threaten public well-being and national economies.
- Protecting the Amazon should be treated as an economic, social, and public health priority, argues Peruvian American ecologist Enrique Ortiz, because the forest helps sustain water supplies, food production, energy systems, and climate stability across South America.
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Slow lorises struggle to survive in the wild after captivity (May 22 2026)
The wild can be a “death trap” for rescued slow lorises, one of the world’s most trafficked primates, according to a recent study, reports Mongabay’s Carolyn Cowan. Researchers followed the fate of nine confiscated Bengal slow lorises (Nycticebus bengalensis) released into Lawachara National Park in Bangladesh. Six months later, only two individuals were surviving; several […]

Amazon resilient to fire, but diversity loss still a threat, study finds (May 21 2026)
- A two-decade study conducted in the southeastern Brazilian Amazon found that while degraded forests show high ecological resilience and no sign of transitioning to savanna, species diversity at forest edges halved.
- Repeated disturbances are replacing fire-resistant specialist trees with fast-growing, generalist species, which have repercussions for the biome’s biodiversity.
- Although researchers say the forest’s response is a sign of hope, they warn that the new ecosystems that emerge from that forest recovery process can be vulnerable to new climate disturbances.

New survey methods uncover new insights into Madagascar’s biodiversity (May 21 2026)
- LIFEPLAN tracks arthropods, fungi, mammals and birds simultaneously using identical methods repeated year-round across continents, generating one of the largest standardized biodiversity data sets ever assembled.
- A forthcoming study found that geographic distance is a key driver of endemism in Madagascar’s arthropods.
- Entomologists use LIFEPLAN data to identify new priority areas for insect conservation that are not represented in the current protected area network.
- Researchers say they hope LIFEPLAN methods can support long-term biodiversity monitoring in Madagascar’s protected areas in collaboration with different partners.