“Is it chewing?” someone asks. As if by director’s cue, all heads lean in.
“That’s the tail,” says Walt the vet. Walt has a keen observational eye, honed by a span of years as a poultry inspector (“4.8 seconds per bird”).
Lee pulls back on the endoscope and works it over to the other end. The superworm’s mouthparts are still. Nothing is moving. Walt tells us about a phenomenon he calls the “blanket effect.” To calm a wild horse prior to treating it, a vet may herd the animal into a narrow chute lined with packing peanuts that gently presses in on its sides. It is the same principle behind swaddling an infant or hugging a distraught friend or dressing a thunder-phobic dog in an elasticized Thundershirt, available in pink, navy, and heather gray. Mercifully, stomach walls seem to act as a mealworm Thundershirt.
Before the superworm was presented to the frog, Lee looped a thread around its middle and secured it with surgical glue, so he could retrieve it later. Now that time has come. The frog surrenders its lunch seemingly without concern, and the superworm is left in a petri dish to recover. John Gray goes to get a chuckwalla, placing the superworm back behind the lizard’s teeth. Same result. The superworm quickly goes still but does not die.
One thing is clear from these experiments. Mealworms are not much troubled by gastric—that is, hydrochloric—acid. Many people, including myself when I began this book, think of hydrochloric acid more or less the way they think of sulfuric acid, the acid of batteries and drain cleaners and hateful men who wish to scar women’s faces. Sulfur likes to bind with proteins, radically altering their structure. If that structure is your skin, you come away from the experience disastrously altered. Hydrochloric acid isn’t as caustic.
For me the confusion can be traced to the movie Anaconda, the scene in which the giant snake rises from the water to regurgitate Jon Voight’s character, his face melted like wax. Some time back, I visited the lab of my favorite snake digestion expert Stephen Secor, the technical consultant on Anaconda. I told him I wanted to experience gastric acid, to get a sense of what it might feel like to be alive inside a stomach. He made me promise not to tell his wife, who oversees safety protocol for the university’s labs, and then he took a bottle of hydrochloric acid off a shelf and put a dab—five microliters—on my wrist. I braced for sharp heat, as from a drop of scalding water. It was a full minute before I felt anything at all, and then only a weak itch. He added another drop. At three minutes, the itch turned to mild irritation, which held more or less steady for twenty minutes, then faded to nothing. It left no mark.
But stomachs secrete more than a single drop of hydrochloric acid. And they keep on secreting, readjusting the pH as the digesting food buffers the acid. My guess is that the situation inside an actively secreting stomach lies somewhere between what occurred on my wrist and what happened to the Japanese factory worker who fell into a tank of hydrochloric acid seven feet deep. The case report states that his skin turned brown and the delicate tissue of his lungs and digestive organs underwent “dry coagulation necrosis.” Burning—whether from acid or from heat—denatures proteins. It changes their structure. It is denaturing that solidifies the boiling egg, that curdles milk, that distorts the burn victim’s skin. Inside a stomach, hydrochloric acid denatures edible proteins, making them easier for digestive enzymes to break down.
The effects of gastric acid are insidious but far from instantaneous, especially if the eaten entity is, like a superworm, protected by an exoskeleton. Crabs vomited after three hours in the stomach of the Asian crab-eating snake Fordonia leucobalia have been known to stand up and run away. I have an eyewitness for this: University of Cincinnati biologist Bruce Jayne. Jayne had “gently massaged” the snakes’ bellies to get them to surrender what they’d eaten, so he could tally it for his research. Because you can’t just ask them.
But without Bruce Jayne to massage the belly, without Lee Lemenager to pull the surgical thread, without God making the whale regurgitate, there would seem to be no way out.
Parasites are the exception. “Parasites bore all over the place,” says Professor Tracy. Some are equipped with a boring tooth, like a drill bit installed on the top of the head. “That’s what they’ve evolved to do. But these are mealworms, for crying out loud.” Larvae burrow, but they don’t bore. “How the hell would they know to tunnel out?” Walt the vet agrees. He is off and running with a story about the giant kidney worm, a parasite that bores out the entire organ and then exits the body through the urethra. He jerks his elbow toward the endoscope. “You could watch it coming with that scope.”
TRACY IS GOING to give the superworms one last chance, the best possible chance, to see if they can chew their way to freedom. They will be put inside a dead stomach—one with no secretions and no muscle contractions.
Where do you find a stomach on a Thursday afternoon in Reno?
“Chinatown?” suggests someone.
“Costco?”
“Butcher Boys.” Tracy pulls his phone from a pocket. “Hello, I’m from the university”—the catchall preamble for unorthodox inquiries. “I’m wondering, is there any chance at all we could get a fish stomach from you?” Tracy waits while the man goes to ask someone and/or make twirling finger motions at his temple for the benefit of his coworkers. The lab falls quiet. The feeder crickets chirp in the next room. “No stomachs of anything? No. Okay.”
John Gray lifts his head and says, in his quiet way, “I’ve got a dead leopard frog in the freezer.”
Everyone takes a break while Gray goes to defrost his frog under a warm tap. Walt entertains us with talk of an alternative-medicine experiment going on at the medical school—healers practicing Reiki on mice. Tracy walks next door to get a toad to show me, a new species he discovered doing fieldwork in Argentina. He returns with it in a glass dish, cradled against his belly. He looks like a kid standing in the kitchen with his cereal bowl. It’s a nice toad, less warty than some. I tell him this, and he seems pleased. “You could be the first person to like this species.” Second, I’m pretty sure.
“You could be the last too,” says Lee, more of a frog guy.
Gray rejoins the group with the defrosted leopard frog, now pinned in a dissecting tray. Lee snips up the midline of the belly and peels back the flaps of skin as if they were stage curtains. Professor Tracy slides a superworm into the stomach.
The 1925 essay “The Psychology of Animals Swallowed Alive” opens with the author sitting “in quiet contemplation digesting after dinner” and wondering whether animals that swallow their prey live[61] are “worried by the acrobatic effects of victims trying to escape.” If this leopard frog were alive, if frogs have the neurological wherewithal to worry, then the answer must be yes, they sometimes worry. The mealworm, with obvious worries of its own, animates the frog stomach like a sock puppet, arcing and straightening and squirming in the snug pink sac for fifty-five seconds. Then it stops completely. “Blanket effect,” says someone.
The superworm is extracted and set aside. Like the others, it is motionless but not dead. And as with all the earlier entrées, this one will wake up after half an hour or so outside the stomach and appear to be fully recovered. A second worm is left in place overnight, to rule out the possibility that superworms can shrug off the blanket effect and resume their efforts to escape. It is dead by morning. “There is no way in my mind that they can eat their way out of stomachs,” states Tracy.
Walt is not as sure. He was impressed by the vigor of the superworm’s struggle. “What if there were a weak spot in the stomach?” Might it be possible to escape a stomach by rupturing it with an especially forceful squirm?
61
Those of you who swallow oysters without chewing them may be curious as to the fate of your appetizers. Mollusk scientist Steve Geiger surmised that a cleanly shucked oyster could likely survive a matter of minutes inside the stomach. Oysters can “switch over to anaerobic” and get by without oxygen, but the temperature in a stomach is far too warm. I asked Geiger, who works for the Florida Fish and Wildlife Research Institute, about the oyster’s emotional state during its final moments inside a person. He replied that the oyster, from his understanding, is “pretty low on the scale.” While a scallop, by comparison, has eyes and a primitive neural network at its disposal, the adult oyster makes do with a few ganglia. And mercifully, it is likely to go into shock almost immediately because of the low pH of the stomach. Researchers who need to sedate crustaceans use seltzer water because of its low pH. Geiger imagined it would have a similar effect on bivalves. But you might like to chew them nonetheless, because they’re tastier that way.