The Inner Lives of "Food Animals"
Will growing scientific evidence about nonhuman cognition bring an ethical revolution in terms of who (not “what”) we eat?
By Barbara J. King, Guest Blog, Scientific American
March 16, 2017
Groupers, a warm-water fish in the sea bass family, hunt for food together with wrasse and giant moray eels. If during a chase, the intended prey slips away into a hidden crevice, the grouper sometimes assumes a vertical position directly above the hiding place, then shakes his or her head repeatedly.
Groupers do this, University of Cambridge zoologist Alexander Vail and his colleagues discovered, when their hunting partners are positioned in such a way as to notice the signal. The communication is effective: the partners often respond by immediately exploring the indicated niche.
It’s a neat example of what’s called referential signaling, a kind of smart purposeful communication that may be viewed as surprising in fish—and thus also an example of a “food animal” showing us that they think.
In this, the groupers aren’t alone. An explosion of scientific studies in the last decade reveals that many animals who grace our tables both think and feel as they go about their days. From scientific study, we may not always be able to discern with precision what they think or feel, yet their behavior leaves clues strong enough to withstand charges of anthropomorphism, the wishful projection of human qualities onto other animals.
As science writer Brandon Keim has put it, “What once was considered anthropomorphic thinking is now mainstream science.” I’d add that science is finally beginning to embrace animals who were, for a long time, considered second-class citizens.
As Annie Potts of Canterbury University has noted, chickens distinguish among one hundred chicken faces and recognize familiar individuals even after months of separation. When given problems to solve, they reason: hens trained to peck colored buttons choose 9 percent of the times to give up an immediate (lesser) food reward for a slightly later (and better) one. Healthy hens may aid infirm friends, and mourn when those friends die.
Pigs respond meaningfully to human symbols. When a research team led by Candace Croney at Penn State University carried wooden blocks marked with X and O symbols around pigs, only the O carriers offered food to the animals. The pigs soon ignored the X carriers in favor of the O’s. Then the team switched from real-life concrete objects to T-shirts printed with X or O symbols. Still, the pigs ventured only toward the O-shirted people: they had transferred their knowledge to a two-dimensional format, a not-inconsiderable feat of reasoning.
I’ve been guilty of biased expectations, myself. At the start of my anthropology career almost four decades ago, I was firmly convinced that monkeys and apes out-think and out-feel other animals. They’re other primates, after all, animals from our own mammalian class.
Fairly soon, I came to see that along with our closest living relatives, cetaceans too are masters of cultural learning, and elephants express profound joy and mourning with their social companions.
Long-term studies in the wild on these cerebral mammals helped to fuel a perspective shift in our society: the public no longer so easily accepts chimpanzees or monkeys made to undergo painful invasive procedures in biomedical laboratories; elephants forced to perform in circuses, and dolphins kept in small tanks at theme parks.
Over time, though, as I began to broaden out even further and explore the inner lives of fish, chicken, pigs, goats, cows, and octopus, I started to wonder: Will the new science of “food animals” bring an ethical revolution in terms of who we eat? In other words, will the breadth of our ethics start to catch up with the breadth of our science?
Animal activists, including vegetarians and vegans are already there, of course, committed to not eating these animals. But what about the rest of us? Can paying attention to the thinking and feeling of these animals lead us to make changes in who we eat?
One set of clues comes from Esther the Wonder Pig...