Now is the time to unlearn everything you’ve ever heard about snakebite.

The first snakebite I was involved with happened years ago on the back porch of a house in South Austin, and I remember it like people recall political assassinations and earthquakes. I was asleep when I heard the screams, and not wanting to wake up, incorporated them into the fabric of my dream: Bill and Elaine, the couple downstairs, were having a terrible fight. The reality was much worse. Bill’s little Western diamondback had escaped during the night and, using the expandable-collapsible strategy that has made rattlesnakes such successful predators, fold its two-footed length into one of his tennis shoes. When he stuck in his thumb, he pulled out the rattler. By the time I got there he had shaken the snake loose and collapsed on the floor. I had just hauled him to his feet when Elaine plopped him back down, on the theory that one should move as little as possible after a snakebite. It was the only rule we could remember with certainty. Cutting Bill’s finger open was more than I could steel myself for on a moment’s notice, and while using a tourniquet seemed like a good idea, we weren’t sure where to put it. There’s not much meat on a thumb and we were dealing with a particularly skinny one, so we settled for an ice cube on the bite instead.

Bill seemed willing to accept any treatment with the same depressed equanimity: like some dying general, he had grown oblivious to everything except charging me with the responsibility of locating the vanished rattlesnake. A more immediate problem was that we couldn’t find the keys to any of the four available cars, and digging through the pile of jeans on the floor, listening simultaneously for the jangle of keys and the whir of the hidden diamondback, was such touchy going that at last we had to rely on the help of a fourth party to drive us to the hospital.

This sort of confusion is typical of the emotional chaos following the majority of venomous snakebites. Most of the panic, of course, comes from the traditional notion that the victim is going to die, but with the exception of a small child deeply bitten by a big rattler, that’s simply not the case. Even with no treatment at all, the vast majority of people bitten by Texas’ venomous snakes would not die, and with modern medical care less than one per cent do. Almost none are well-read, prepared backpackers, hunters, or campers. Those who get bitten most often are herpetologists, snake buffs like Bill, laborers working in overgrown areas around old farm buildings, and kids.

Almost all bites are inflicted by pit vipers. This group of snakes includes Texas’ ten rattlesnakes as well as its three kinds of copperheads and the cottonmouth, all of which inject their hydraulically compressed toxins well beneath the surface of the skin through curved hypodermic fangs. Crotalus atrox, the Western diamondback, is responsible for nine out of ten bites in the state. Diamondback venom is virulent and plentiful; the largest rattlers carry as much as a sixth of a teaspoon of it, although because of the spongelike internal structure of the venom glands, no pit viper can squeeze out more than a quarter of its capacity per bite. A few bites are recorded every year by East Texas canebrake rattlers and High Plains prairie rattlers, which also have a good deal of slightly less toxic venom. Getting bitten by any other species is—­at least statistically—only a theoretical danger, though feisty black-tailed rattlers are common in the Chisos, Davis, and Guadalupe mountain parklands. Pygmy rattlesnakes and massasaugas have little venom, of moderate potency, but are reclusive and seldom bite anybody except reptile collectors. By far the most virulent of the rattlers is the Mojave, a desert snake of the southwestern U.S. and northern Mexico. Its venom is exceptionally high in neurotoxins, making it ten times more potent than that of the Western diamondback. But being bitten by a Mojave in Texas is about as unlikely as being struck by lightning, since they are very rare and live only in inhospitable parts of the Trans-Pecos.

Diamondback bites are most common in Central and West Texas, while copperhead bites occur more often

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