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“Due to the Earth’s atmospheric influences, tropical rainforests do not have four distinct seasons like the temperate zones we’re familiar with. Instead, they have two main seasons: dry and wet. The dry season isn’t as arid as you might think—there’s still rainfall every few days—but because temperatures are extremely high, the ground can occasionally crack from dryness. However, it usually rains again within a few days to alleviate that. In the rainy season, it rains almost daily, or there may be continuous overcast and rainy weather for days or even weeks, somewhat like the Huangmei season in China’s Jiangsu and Zhejiang regions. Even more extreme, in the Amazon rainforest, heavy rainfall during the wet season can flood large areas of land until the dry season returns and the water gradually recedes.”
“Thanks to the unique climate and humidity of tropical rainforests, flora and fauna thrive here. If you venture into a rainforest, you’ll find no other place on Earth as vibrant. Many tropical rainforest countries lack developed rail systems and instead connect through small airports. This is mainly because in tropical regions, plants grow very rapidly—if rail lines are built, they’re soon overgrown by vegetation, requiring significant manpower and resources for clearing, making it too costly. That’s why tropical rainforest areas often feature isolated, island-like city distributions.”
Ten Risks
Tropical rainforests are among the most dangerous places on Earth, alongside polar regions and deserts, ranking as three of the globe’s most perilous zones. Navigating through them requires you to contend with a wide variety of challenges—often more complex than those found elsewhere. Let’s break them down.
1. Direction
In most other environments, there are many ways to determine direction, but once you’re deep in the rainforest, the dense canopy makes it difficult to locate the sun. In such situations, you’ll have to rely on your compass or GPS to find your bearings.
2. Extreme Temperature and Humidity
Inside a tropical rainforest, there's no real concept of “dry”—it’s humid and hot everywhere. With thick tree cover blocking air circulation, walking through the rainforest feels like moving through a steamer. The humidity level remains constantly between 80% to 99%, leading to a major issue: sweat doesn’t evaporate, leaving all your clothes feeling sticky against your body. When sweat clings to you for extended periods, the salts and oils secreted by your body provide an ideal breeding ground for bacteria. This causes extensive skin inflammation. In such cases, you can only hope for a clean water source or a heavy downpour. Due to the extreme humidity, starting a fire also becomes very difficult—you may struggle to find even a bit of dry wood to create a stable flame.
3. Extreme Terrain Caused by Climate
With abundant rainfall, the rainforest is prone to natural disasters like mudslides, landslides, and floods. You may also encounter terrain uncommon elsewhere, such as swamps, deep pools, waterfalls, and caves. In unfamiliar areas, you must stay extremely cautious to avoid hazardous environments.
4. Insects
With year-round warmth and plentiful rainfall, insects are plentiful in tropical regions all year long. They’ll follow you throughout your journey and seize any chance to bite or suck your blood. Because tropical biodiversity is so rich, you’ll find it’s not just mosquitoes bothering you—there are also tiny bugs that can even slip through your hammock netting. They’re unfriendly and bizarre, and even entomologists can’t always identify them. The forest floor is like a bug convention, with all kinds of creatures crawling around, and you never know which ones might be venomous.
5. Microorganisms
In a complete ecosystem, how could microorganisms—such an essential component—be missing? Most microorganisms won’t harm you under normal circumstances. But if you suffer even a minor injury, or if your skin is simply rubbed raw by clothing, or if you consume contaminated food, these microbes can cause serious trouble. Viruses and bacteria can quickly lead to redness, swelling, and inflammation. Eating tainted food can cause digestive tract infections. These conditions can be life-threatening during outdoor activities.
6. Leeches
Infamous leeches certainly won’t pass up the favorable conditions of the tropics. Due to the humidity, tropical regions have an abundance of leeches in a wide variety of species. They are arguably the most annoying creatures in the rainforest. Ranging from thread-thin to ping-pong ball-sized, these leeches will open your eyes—literally. Unfortunately, there’s currently no surefire way to fully protect against them. They live not just in water or on the ground, but also in high places like trees. The moment they sense an animal passing below, they’ll “drop” from leaves onto you without you noticing. After sucking your blood, they quietly detach. And it’s not just the blood loss—it’s the wound that takes a long time to heal, and their mouths carry various bacteria and viruses, increasing your risk of infection.
7. Plants
Due to intense competition among species, plants have evolved numerous self-defense mechanisms. Poisonous and thorny plants are common in tropical rainforests. They can scratch your clothes, backpacks, and then your skin. If you accidentally touch a thorny tree, pray for your hands. There are also more toxic plants in the tropics than in other regions. Be very careful about consuming any wild plant-based food—you never know which harmless-looking plant might be deadly.
8. Animals
The animals in tropical rainforests are incredibly diverse. Every night, you’ll fall asleep to strange sounds, and wake up to equally odd calls. The dangers posed by carnivores have been covered in many posts, so we won’t elaborate here. But be aware of less conspicuous omnivores and herbivores—if you encounter them during their mating or parenting season, they may fiercely defend their young against you. Monkeys and apes, if you enter their territory, won’t hesitate to hurl whatever they can find at you—and with impressive accuracy. Of course, most animals now know humans are a fearsome presence and tend to avoid us. But deep in the rainforest, there are still many unexplored areas where animals won’t just run away. An ape, driven by curiosity or tempted by the scent of your food, might easily sneak into your camp while you sleep, tearing into your clothes, backpack, and shoes, searching for anything fun or edible. And in the rainforest, losing these items could leave you stranded.
places. There, the animals won’t just run off. Apes, out of curiosity or because your food smells too good, may wait until you’re asleep and effortlessly sneak into your camp to rip open your clothes, backpack, or shoes, looking for anything entertaining or tasty. In the rainforest, without those items, you might not get far.
9. Mental
The environment of the tropical rainforest, with its dense plant growth, often means you can’t see the sky for most of the time. In a city, you might not notice this, but in the rainforest, it creates immense psychological pressure. Add in the high heat and humidity, mosquito harassment, and anyone with less-than-sturdy mental resilience may experience a breakdown. Even without physical injury, this can put you in a very dangerous situation.
10. Humans
Actually, I thought long and hard about whether to include this part when writing it. But in the end, I decided to write it because the reality is just too harsh. In the rainforest, the most dangerous things are not actually those natural elements I mentioned above, but humans. Due to the region’s inaccessibility, many tribes in the rainforest, though somewhat civilized, still harbor suspicion or even hostility toward outsiders. Because of how difficult it is to enter tropical rainforests, many poachers and drug traffickers choose to live there. And these people won’t reason with you. In such an environment, you might not even have the chance to call for help. Even the fiercest animals follow behavioral patterns, but the hardest thing to predict is human nature. There’s a well-known concept called the “Dark Forest Principle,” which describes how when you encounter a stranger, you can never be sure whether they mean you harm or good. Many people choose to protect themselves by attacking others. In truth, the other person might be thinking the exact same thing.
Feeling a bit scared now? Outdoor activities come with all kinds of risks. But clever humans always find ways to overcome them, and in the next article, we’ll talk about how to survive in extreme environments like the tropical rainforest.