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Someone carelessly tossed a machete in the bottom of the boat, your barefoot friend stepped on it, and now he has a laceration that is bleeding all over the place. Do not panic. Here are the steps to take.


In the jungle, any open wound — abrasion, puncture, avulsion, incision, or laceration — is an invitation to infection. To understand infection, and how to tell if you have one, it is helpful to understand the normal process of wound healing, or inflammation.


I have mentioned that the temperature in the jungle remains pretty steady at around 85 degrees and the relative humidity at about 90 percent. Although the temperature in the jungle does not get as high as it does in the desert, the high humidity prevents the rapid evaporation of sweat, which is one of the body’s primary cooling mechanisms. You can be perfectly comfortable under most jungle conditions, but you can still get heat illness if you are not careful.


I have talked about Crotalid or pit viper envenomations. Elapids or coral snakes are different from the Crotalids in a number of significant ways. Coral snakes are generally shy and docile, and they do not attack unless deliberately provoked. Fewer than forty percent of Elapid bites result in significant envenomation. Fatalities are rare.


I have written about the varieties and habits of snakes in the Upper Amazon and how snakebite is treated by local healers. Remember, of course, that your chance of being bitten by a venomous snake in the Amazon is really very small, especially if you take basic precautions, such as not sticking your hand blindly into places where a snake might be sleeping. It is probably worth noting that more than fifty percent of pit viper envenomations in North America are associated with alcohol ingestion on the part of the victim.


I have mentioned before that getting clean potable water can be difficult in many parts of the Amazon, including the larger cities. In fact, I strongly recommend against drinking any untreated water in the Amazon, no matter how clear and tempting it might appear. And that includes rainwater, unless you know that the containers in which the water has been caught and stored have been properly cleaned and maintained.


We have talked before about the image of the jungle in the European imagination. Part of that mythology is that the jungle — filled with what German filmmaker Werner Herzog called “fornication and asphyxiation and choking and fighting for survival and growing and just rotting away” — has a mysterious power to drive Europeans crazy.


The first thing I was taught by Gerineldo Moises Chavez, my jungle survival instructor, was how to build a tambo, a jungle hut. It wasn’t fancy, as you can see, but it kept me dry when it rained and kept me off the ground while I slept. In fact, all ribereño houses are built on exactly the same principles — a thatched house on stilts, built entirely of jungle materials, which may range in size from a small temporary hunting shelter, just large enough to sleep one or a few people, to an elaborate structure able to house an extended family.


There are a number of places in the Upper Amazon which are particularly good for finding fish. Large and medium-sized rivers in low areas often form numerous meanders which, when the river changes course, become cochas, oxbow lakes. These cochas often have sediment settled on the bottom, relatively clear water, and high temperatures, and therefore rapid plant growth, which in turn supports quite large fish populations. Sometimes too you can see strips of clear and very slow water in a river. These are quiet places where plankton tends to grow; you can usually find fish downstream. You can also find fish under camalones, places where aquatic vegetation has formed a dense mat on the surface of the water. And fish love to move into the waters covering seasonally flooded forests.


There are two families of venomous snakes in the Upper Amazon — the Crotalidae or pit vipers and the Elapidae or coral snakes. The Crotalidae are called pit vipers because they have a pit or depression between the eye and the nostril on each side of the head, which functions as an extremely sensitive infrared heat-detecting organ. In the United States, there are three genera of the Crotalidae family — the copperhead, the cottonmouth or water moccasin, and fifteen species of rattlesnake.


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