If you have ever given up pursuing your crush because you think that your rival’s appearance is more good-looking and his gesture is more romantic than you, the fiddler crab can teach you a valuable lesson.

Sentience is the capacity to have feelings, such as feelings of pain, pleasure, hunger, thirst, warmth, joy, comfort and excitement. It is not simply the capacity to feel pain, but feelings of pain, distress or harm, broadly understood, have a special significance for animal welfare law. Drawing on over 300 scientific studies, we evaluate the evidence of sentience in two groups of invertebrate animals: the cephalopod molluscs or, for short, cephalopods (including octopods, squid and cuttlefish) and the decapod crustaceans or, (...) for short, decapods (including crabs, lobsters and crayfish). We also evaluate the potential welfare implications of current commercial practices involving these animals. (shrink)

Crump et al.’s contribution to assessing whether decapods feel pain raises an important question: Is pain distributed unevenly across the order? The case for pain appears stronger in Pleocyemata than in Dendrobranchiata. Some studies report pain avoidance behaviors in Dendrobranchiata (Penaeidae) shrimp, but further studies are needed to determine whether the chemicals used are acting as analgesics to relieve pain, or as soporifics to reduce overall alertness. If the latter, the most farmed shrimp species may not require the same level (...) of protection as crabs, crayfish, and lobsters. (shrink)

The birth of a new science is long, drawn out, and often fairly messy. Comparative psychology has its roots in Darwin’s Descent of Man, was fertilized in academic psychology departments, and has branched across the universities into departments of biology, anthropology, primatology, zoology, and philosophy. Both the insights and the failings of comparative psychology are making their way into contemporary discussions of artificial intelligence and machine learning (Chollett 2019; Lapuschkin et al. 2019; Watson 2019). It is the right time to (...) turn a philosophical lens onto the methodologies of comparative psychology. That is the aim of this Element. -/- Comparative psychology is the umbrella covering the different ways scientists study animal mind and behavior. Comparative psychologists study animal behavior and mentality, including the mechanisms and inner states that allow crows to form hooks, vervet monkeys to give warnings, crabs to make trade-off decisions, and humans to use language. While focus is on the similarities and differences between different species, capacities are often studied in terms of their evolutionary history, development, and current ecological or cultural context. What this entails is that comparative psychologists have a range of different kinds of training, different areas of expertise, and different research questions. One comparative cognition researcher compares children and dogs on causal reasoning abilities (Daphna Buchsbaum), another looks at memory in corvids (Nicola Clayton). An animal behaviorist examines raccoon territories in a city (Suzanne MacDonald). One anthropologist looks at war in wild chimpanzees (John Mitani), another looks at how innovations are adopted in capu- chin monkeys (Susan Perry). One ethologist looks at play in wolves (Marc Bekoff), and another looks at deception in birds (Carolyn Ristau). One biologist looks at male alliances in dolphins (Richard Connor), and another examines economic game performance in apes and monkeys (Sarah Brosnan). An animal welfare scientist studies the effect of enrichment on mink (Georgia Mason). A learning theorist looks at gambling in pigeons (Thomas Zentall). A zoologist studies social learning in bees (Lars Chittka). It is not easy to guess in which department you’ll find a comparative psychologist. -/- This Element aims to examine the methods of comparative psychology, which remains especially concerned about how to study animal minds and behavior without falling prey to fuzzy thinking. Animals can be cute, so humans are often intrinsically drawn to them; and this love of animals is sometimes taken to be at odds with being a careful scientist. The methods of comparative psychology reflect this worry with their special emphases on avoiding bias and on avoiding developing warm relationships with animal subjects. The first two sections analyze three textbooks to examine what young scientists are taught. Section 1 investigates three methodological principles students are taught to follow: Anti-anthropomorphism, Morgan’s Canon, and Anti-anthropocentrism. I argue that the first two principles should be discarded, and that developing relationships with animals should no longer be discouraged, as relationships promote understanding. Building on this critique, in Section 2 I challenge the common prohibition against including animal consciousness in comparative psychology by arguing that it does not harm the science, but promotes it. Setting aside the special prohibitions for comparative psychology, in Section 3 I examine how the quest for objectivity in comparative psychology introduces its own bias and argue that the different disciplines of comparative psychology will introduce different biases; the best scientists can do is identify the sources of bias. The quest to eliminate all bias is a misguided one. Section 4 applies these issues to recent debates in ape cognition research between scientists who work in the field and those who work in the lab, and suggests best practices for integrating knowledge from both sources. -/- I have had the opportunity to work with a number of comparative psychologists in a variety of contexts, including a stint at Lou Herman’s dolphin communication lab in the 1990s, collaborative studies with Peter Verbeek on the child’s theory of mind at the University of Minnesota’s Institute for Child Development, conducting research on orangutan pantomime communication with Anne Russon at her field sites in Borneo, research on rat social learning with Noam Miller at Wilfrid Laurier University, and co-teaching a field course in dolphin communication with Kathleen Dudzinski. As a philosopher of science who has been in the field and in the lab, I have a perspective from which to compare the comparative psychologists. This Element is my attempt to synthesize almost thirty years of experience and thinking about how to study animal minds. (shrink)

The higher number of species on Earth is equivalent to the higher number of possibilities humans can take inspiration from for innovations. Many technological innovations have been successfully generated based on inspirations from wildlife species, such as parasitic wasp-inspired needles, gecko-inspired surgical glue, peacock-inspired biosensors, fiddler crab-inspired artificial vision system, etc. Or, why don’t you imagine what human societies would have been without Penicillin if Alexander Fleming had not observed the Petri dishes containing Staphylococcus bacteria and noticed something strange. (...) Therefore, it is argued that conserving biodiversity sustains our livelihood and contributes to advancing human civilizations. (shrink)