No one ever asks me: what about
cuttlefish? I hesitate to link to Wikipedia, but most of the accessible Internet material on cuttlefish are about cuttlefish as food. Maybe if I lived in Italy I would hear this question more often.
For those who don't know, cuttlefish are an invertebrate sea animal, a type of cephalopod (cuttlefish are actually 120 or so separate species). Like some other cephalopods, they have a remarkably complex but partly distributed nervous system and 'brain'. I put brain in quotes because their brains are somewhat different from mammalian brains. Their
ganglia are spread out around their bodies, making their brains a bit more spread out, rather than more centralized as it tends to be in mammals.
In the interests of full disclosure, I'm not an ethologist, biologist or zoologist. So, it's very possible that I will get some of the word choice and details that I use in this essay wrong. However, I do read a fair amount of cognitive ethology reading because I am interested in nonhuman animals, and understanding a nonhuman animal both as an individual and as a species in some detail helps us to understand how to act morally with respect to them.
I do believe that we may owe many invertebrate species at least some moral consideration. It's possible that not all invertebrates share all of the same interests that other nonhuman animals (whether vertebrate or invertebrate) do. In fact, the vertebrate/invertebrate distinction may not be all that meaningful to our moral conception of nonhuman animals. What really matters is sentience. The vertebrate/invertebrate divide may help us make generalized statements about who is sentient and what is not, that seems to be less and less the case.
As one invertebrate among millions and millions of invertebrate species, cuttlefish, however, are remarkable. They change colours to hide from predators similar to a way a chameleon does. They deceive both their predators and their prey. They form relationships. They play. They learn. They have brains. In short, they evince many of the behaviours of more complicated mammals. Yet, even among those who take mammalian sentience as mostly given, there's debate about cuttlefish and other invertebrates because their skeleton is on the outside rather than on the inside, their brains are more distributed than centralized and because it is not clear whether or not they experience pain the way mammals do. The question this blog answers is, what moral difference does this make?
I've never been asked a moral question about cuttlefish, but I am asked, fairly often, about insects (another type of invertebrate); in particular, whether or not we owe them some moral consideration. But when I'm asked about insects, I normally respond by asking "Which insect?" And if we're going to talk about insects, why not talk about all invertebrate animal species?
Most invertebrates share a roughly similar ganglionic nervous system; all share an exoskeleton ('bones' on the outside rather than on the inside). To use an unscientific metaphor, where our brains are more like a personal computer (centralized), theirs are more like a network (spread out). But we cannot assume from this that it makes their cognition less efficient, or that they do not cognize the world at all. In fact, if we take science seriously, then we should be careful to infer too much about what may happen or not happen in their minds (if they can be said to have them) and how they observe and respond to the world (if they can be said to do so).
But it seems reasonable to at least pose the question: why does an animal species have sense organs and and a 'brain' if they don't have minds and a unique perspective and a set of interests? And if an animal has a perspective, and interests in light of that perspective, what are our moral duties?
Part of the problem today with our understanding of sentience is that our understanding of it is based on an observable response to painful stimuli in a laboratory. There are a lot of different understandings of what makes a being sentient, but this is one of the most common. It precludes, of course, my ABS breaks and my thermostat from being said to be sentient. However, it may also preclude a great number of nonhuman animals just because their brains and nervous systems are wired slightly differently from mine.
The
IASP defines pain as �An unpleasant sensory and emotional experience associated with actual or potential tissue damage or described in terms of such damage.�Historically, if an animal is poked enough that it seems to register a pain response, only then do we start to figure some amount of cognitive processing may be happening. If there is some cognition happening, then an animal is probably sentient.
If an animal is sentient, then, as a matter of moral philosophy, they may have interests. If an animal has interests, then they may have moral rights. If a nonhuman animal does has moral rights. In short the abolitionist vegan position argues that all animals insofar as they are sentient have an interest in continuing their lives, not experiencing pain, etc., and so they have a moral right not to be used as property and should have a legal right not to be used as property. We take the moral baseline of not using nonhuman animals to be veganism.
The moral meaningfulness of pain response, however, in some respects, goes back to Descartes' argument about whether or not animals feel pain and how this shapes our moral views in light of them. Descartes argues that they cannot, and so, we do not owe any nonhuman animals any moral duties. In many respects, pain response has shaped scientific and philosophical understandings of sentience since. Of course, it is worth pointing out that in the public mind (and certainly philosophy), as
Gary L. Francione has argued, that Descartes is a minority in his views that nonhumans could not feel pain.
Both Hume and Voltaire (among others), for example, express their fair share of acrimony toward Cartesianism for this reason. It reflects a divide in the history of natural philosophy (the fore-runner to science among other disciplines). Descartes and Cartesians generally reflect a tendency toward knowing truth through rationalism. They propose that we can deduce and know things about reality and our moral response to it by reasoning carefully about it. Hume, as another example, reflects a tendency towards empiricism (looking at reality and trying to reason about what is true with respect to reality inductively). These aren't necessarily mutually exclusive, of course, but they do reflect differing tendencies towards understand "the truth".
Both empiricism and rationalism have been taken with a larger grain of salt over the twentieth century. In a society in which the level of science has problematized simple observation (e.g., how are we going to simply observe quantum mechanics?), empiricism has been qualified. Relying on falsifiability the way we do, how do we make scientific sense of Descartes claim that �I think therefore, I am�? How could we design an experiment that shows some reasonable truths to be false and therefore, scientific? In a scientifically advanced society that divides questions we can disprove and questions we cannot disprove as nonscience and science, rationalism has also been qualified.
In short, as ethical agents who take careful reasoning and science seriously as formative to our moral views, we need both rational and empirical methods of unconcealing the world, in order to get us to a more accurate picture of reality, in order to act morally in light of it. And whether or not scientists can observe a pain response in an animal species has been one of those methods.
Pain response proposes us with a moral problem, of course. It is wrong to poke and prod (and do much, much worse) to nonhuman animals just to study them. However, it also poses us with a scientific problem. What if nonhuman animals are sentient in ways that do no involve pain response? I podcasted a bit about this recently, but what other criteria might we consider sufficient to believe that a nonhuman animal is sentient?
For example, we might take the view that an example of an emotional life is sufficient. Most mammals have emotions. We might take the view that having a brain is sufficient. Most nonhumans classed as animals have brains. We might take a central nervous system as sufficient, but most nonhuman animals don't have a CNS in the way that I do. Invertebrates, for example, have a different type of nervous system, and as consequence, it's not immediately clear that they experience the world in the same way that I might, but it seems clear that they do experience and respond to the world.
We might take the view that having a perspective (that is, having any of the biology required to observe and respond to the world uniquely) is sufficient. This would regroup a lot of the nonhuman animals we know and don't know sentient into the 'possibly/probably sentient' category from the 'nonsentient' category. It would also move us away from understanding sentience only in terms that preclude summarily the vast majority of nonhuman animals in the world: invertebrates.
Invertebrates include a wide variety of animals, including mollusks (e.g., cuttlefish and octopi), insects proper (bees and ants), crustaceans (e.g., lobsters and shrimp), as well as arachnids (e.g., spiders, mites., etc). Arthropods, what most people of think of as �insects� popularly but include crustaceans, insects and arachnids, for example, make up about 6 � 9 million species. That's about 90% (give or take) of the animal species in the world. The vast majority have not bee studied in any great detail. Many have not even been catalogued. And yet, many of us feel comfortable making sweeping moral judgments about whether we owe them moral consideration from a position of scientific ignorance about them.
In fact, the variety of invertebrate animals is remarkable, ranging from relatively large crustaceans like lobsters to the to tiny mites. Some of them produce opioids and and have opioid receptors (the chemical mechanisms that ease pain in mammals) and some of them do not. Some invertebrates build vastly complicated social organizations (e.g., ants and bees), and some of them are more solitary (e.g., octopuses). Some are enormous and remarkably biologically complicated animals (e.g., octopuses and squids) and some are small and less complicated (e.g., claims), while some are even smaller and still complicated (e.g., bees). Some of them have very remarkably complex nervous systems (like the cuttlefish), some of them (like clams) have very simple two-ganglia arrangements.
But the long and short of it is: there's still a simply amazing amount we still don't know about the vast majority of the nonhuman animals that populate the world, especially invertebrates. We do not all of the species that are sentient. But what is important from an abolitionist vegan perspective is that sentience is the morally meaningful criterion to determine whether or not we owe a being moral consideration of his/her/zir interests. As a general matter, it is morally most cautious not to intentionally harm any nonhuman animal, lest we intentionally harm someone who is sentient.
I agree that it's difficult to determine whether all invertebrates species classed as animals are sentient. Identifying and observing up to 9 million species in the wild to come to some full understanding of whether or not they understand and act on the world will be time consuming and difficult work. Most of us would agree that most of the nonhuman animals we use for food, clothing and entertainment are sentient, and that our unjustifiable use of them is wrong if we sat down and really thought about it clearly.
There is also a body of growing cognitive ethological work that suggests increasingly that, although many invertebrates may not emotional lives, some do, and while not every single species classified as an animal today is sentient, the majority of invertebrates we know probably are. If they are sentient, then we also owe these nonhuman animals moral consideration. If they might be sentient, however, and if it is trivial to avoid harming them, as it almost always is, then why not do so?
Of course, the simplest and most effective way to ensure that we are not harming other animals (human and non) unjustifiably is to take the rights of nonhuman animals seriously and go vegan. If you're not vegan already, you should go vegan today. If you are not an abolitionist, but want to learn more about the approach, feel free to read some of my other articles or head over to
www.abolitionistapproach.com and do some reading.