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“Due to the Earth's atmospheric conditions, tropical rainforests do not have four distinct seasons like the temperate zones we are familiar with. Instead, they have just a dry season and a wet season each year. The dry season isn’t as arid as we might think—there’s still rainfall every few days. However, because temperatures are extremely high, the ground can occasionally crack from dryness, although it usually rains again within a few days to relieve the condition. During the wet season, it rains almost daily, or there may be continuous overcast and rainy weather for days or even weeks, somewhat similar to the plum rain season in parts of China like Jiangsu and Zhejiang. Even more extreme, in the Amazon rainforest, heavy rainfall during the wet season can flood large areas of land, which only gradually recedes when the dry season arrives.”
“Thanks to the unique climate and humidity of tropical rainforests, flora and fauna thrive here. If you enter a rainforest, you’ll find no other place on Earth as vibrant. Many tropical rainforest countries don’t have well-developed railways but instead rely on numerous small airports for transportation. This is mainly because plants grow very quickly in tropical regions, and railways would soon be overgrown, requiring significant manpower and resources to clear—making it too costly. As a result, cities in tropical rainforest regions tend to be distributed in an 'island-like' pattern.”
Ten Major Risks
Tropical rainforests are among the most dangerous places on Earth, ranking alongside polar regions and deserts as the three most perilous regions. Navigating through them means facing all kinds of complex situations, often more so than in other areas. Let’s break them down one by one.
1. Direction
In most other places, there are many ways to determine direction, but once you venture deep into the rainforest, the dense canopy makes it difficult to locate the sun. In such cases, you’ll have to rely on your compass or GPS to figure out where you’re going.
2. Extreme Temperature and Humidity
Inside a tropical rainforest, there’s no real concept of “dry”—everything is damp and muggy. With dense tree cover blocking air circulation, walking through the rainforest feels like being inside a steamer. Humidity levels remain between 80% and 99% year-round, creating a major issue: sweat doesn’t evaporate, leaving clothes feeling sticky against your skin. When sweat clings to your body for extended periods, the salt and sebum your body excretes provide an ideal breeding ground for bacteria, leading to skin inflammation. In such cases, you can only hope for access to clean water or a sudden downpour. Due to the extreme humidity, starting a fire also becomes difficult—you may struggle to find any dry wood to create a stable flame.
3. Extreme Terrain Caused by Climate
With heavy rainfall, natural disasters like landslides, mudslides, and floods are common in tropical rainforests. You may also encounter swamps, deep pools, waterfalls, and caves—terrain rarely seen elsewhere. In unfamiliar areas, you must be extremely cautious to avoid dangerous environments.
4. Insects
Thanks to abundant rainfall and suitable temperatures in tropical regions, insects are plentiful all year round. They’ll follow you throughout your journey and seize any opportunity to bite or suck your blood. Due to the rich biodiversity, you’ll find that mosquitoes aren’t your only problem—there are also tiny bugs that can even slip through your hammock mosquito net. They’re not friendly at all and come in all sorts of bizarre forms—even entomologists can’t identify them all. The ground is like an insect convention, with all kinds of creatures crawling around, and you never know if they’re venomous.
5. Microorganisms
In a complete ecosystem, how could microorganisms, such a crucial component, be missing? Most microorganisms won’t harm you under normal circumstances. But once you suffer even a minor injury—like a scratch or even just redness from your clothing rubbing your skin—any breach in your epidermis, or consuming contaminated food, can cause serious trouble. Viruses and bacteria can quickly lead to swelling and inflammation. Eating tainted food can cause digestive tract infections. These issues can be life-threatening during outdoor activities.
6. Leeches
The infamous leech thrives in the favorable environment of tropical regions. Due to the humidity, leeches are abundant and diverse in the tropics. They are arguably the most annoying creatures in the rainforest. Ranging from thread-thin to ping-pong ball-sized, leeches come in all shapes and sizes. Tragically, there’s currently no surefire way to fully protect yourself from them. They’re not just in water or on the ground—they can be overhead, like in trees. Once they sense an animal passing below, they can “drop” from leaves onto you without you noticing. After sucking your blood, they quietly detach. And it’s not just the blood loss—leeched wounds take 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 more ways to protect themselves. Poisonous and thorny plants are very common in tropical rainforests. They can scratch your clothes, backpack, and then your skin. If you accidentally touch a thorny tree, pray for your hands. There are also more toxic plants in tropical regions than in other areas. Be cautious about eating any wild plants—these seemingly harmless ones could be fatal.
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 of carnivores have been covered in many previous posts, so we won’t elaborate here. But be aware of omnivores and herbivores you might not pay much attention to—if you encounter them during their breeding season, they may fiercely defend their young. Monkeys and apes, for instance, will unhesitatingly throw anything they can find at you if you enter their territory—and they’re surprisingly accurate. Of course, most animals nowadays know humans are dangerous and tend to avoid us. But deep in the rainforest, there are still many places humans have never set foot. The animals there won’t just run away. An ape might, out of curiosity or tempted by the smell of your food, sneak into your camp while you sleep, tearing through your clothes, backpack, and shoes to find anything it deems fun or edible. And in the rainforest, losing those essentials could leave you completely stranded.
places. There the animals won’t just run away. Apes might, out of curiosity or tempted by your delicious-smelling food, easily sneak into your camp while you sleep, ripping open your clothes, backpack, and shoes to look for anything they find fun or tasty. And in the rainforest, without those things, you might not get far.
9. Psychological Factors
Because of the dense plant growth, you often can’t see the sky in a tropical rainforest. While this might not be noticeable in a city, in the rainforest, it creates immense psychological pressure. Add in the high heat and humidity, plus constant harassment from insects, and those with weaker mental resilience may experience psychological breakdowns. Even without physical injury, this can put you in a very dangerous situation.
10. Humans
Actually, I hesitated for a long time before deciding to write this part. But in the end, I chose to include it because the truth is just too harsh. In the rainforest, the most dangerous things are not the natural elements I’ve mentioned above — they are humans. Due to limited accessibility, many indigenous tribes in the rainforest, though somewhat civilized, still regard outsiders with suspicion or even hostility. The difficulty of accessing tropical rainforests has also made them a haven for poachers and drug traffickers who choose to live there. And these people will not reason with you. In such an environment, you might not even have the chance to call for help. Even the fiercest animals follow certain behavioral patterns, but the hardest thing to predict is human nature. There’s a well-known concept called the “Dark Forest Rule,” which describes how when you encounter a stranger, you can never be sure whether their intentions are good or bad. Many people choose to protect themselves by attacking others. In reality, the other person might be thinking the exact same thing.
Feeling a bit scared now? Outdoor activities inherently come with all kinds of risks. But clever humans always find ways to overcome them. In the next article, we’ll talk about how to survive in extreme environments like the tropical rainforest.