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Animal Welfare

Animal welfare is another tradition in environmental ethics, alongside preservation of ecosystems.

Neuron Count and Moral Standing

Under theories of sentiocentrism, it is the capacity to think and feel pain, observed through the presence of a central nervous system, that confers moral standing on an organism. Under models of gradual sentriocentrism, some sentient organisms are given more weight than others. The weighting can be crudely estimated by the number of neurons an organism has in its central nervous system.

The image: "neuron.svg" cannot be found!

Sources: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22. See also Wikipedia for more information.

Brain size, body size, and observed intelligence are roughly correlated, but there are significant outliers; for example, birds tend to have highly packed brains and are intelligent for their size 23. Some species of whale and dolphin also show larger brains than humans 21.

Animals in Captivity

Ethics of animal welfare have typically focused on three captive groups:

  • animals in food production,
  • laboratory animals, and
  • tamed animals in zoos and similar locations.

By sheer numbers, food production marks the largest figures.

The image: "captive.svg" cannot be found!

Source: 24.

Possibly much larger numbers of wild animals are affected by agriculture, pollution, and other human activities, but the figures are very difficult to quantify 24.

Predation

Predation presents a dilemma between animal welfare and some versions of environmental ethics. On the one hand, predation causes substantial suffering and distress to prey creatures, and on the other, predation is an integral aspect of the functioning of ecosystems. Several views have been advanced on the Predation Problem.

Ethical Viewpoints on Predation
ViewAdvocates
It would be right, hypothetically, to prevent predation if it would prevent suffering, but this would actually.Singer, Clark
Non-human predators are not our moral agenda, predation is not a violation of animal rights, and there is no obligation to intervene.Regan
Interfering with predation would be a violation on nature.Kapembwa
We should try to reduce predation if this can be done without increasing overall suffering.Sapontzis, Cowen
We should reprogram predators to cease predation or sterilize them.Pearce
Causing extinction of carnivores would be instrumentally good if this does not cause ecological upheaval.McMahan
Predators should be preserved, as they are an important part of ecology.Hargrove
Predators are also important to conserve.Hargrove
Predation is a 'sad good' that should be respected, an important natural process and driver of evolution.Rolston

Sources: 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35.

Predation can be seen as a special case of wild animal suffering, which occurs also due to hunger, thirst, disease, and other factors. Due to evolutionary factors, which do not value the well-being of particular organisms, this suffering is extensive 36. Although it is difficult to measure precisely, evidence is that suffering dominates enjoyment in nature 37, 38. There are practical measures that have been taken to reduce wildlife suffering, such as wildlife vaccination 39.

Animals for Food

The ethics of raising and eating animals for food are complicated. Though there are many viewpoints on the subject, the following are most common.

Moral Dietary Ethics
PositionExplanation
VeganismAvoid all animal products
VegetarianismAvoid all meat, not necessarily non-meat animal products like eggs or milk
Animal WelfaristsNot necessarily any dietary restriction, concearned about animal welfare
Meat EatersNo restriction

Source: Saja 40.

Following are estimates of the number of farm animals that are killed for dietary needs.

The image: "meat_ethics2.svg" cannot be found!

Number of animals killed to meet the average Pole's meat or animal product intake from a single food source. These figures include male chicks that are killed at birth for egg laying and the loss of calves from artificial insemination in milk production. Source: Saja 40.

Also see our analysis of meat and animal products for more information on this topic.

Ethics of Zoos

Zoos and aquariums are controversial institutions, seeking justification for their (alleged) cost in animal welfare. Zoos and aquariums are often justified for their value to conservation. These institutions can educate the public, inspire greater interest in conservation, raise money, and serve conservation directly as breeding grounds for endangered animals.

The image: "zoo_conservation.svg" cannot be found!

Source: 41.

Zoos have been criticized as vioating the freedom of animals to live a natural lifestyle and for diminishing their quality of life. Among people who have made this criticism, some conservationists and other experts argue that zoos may be justified on conservation grounds 42, 43, 44, while others that it is not 45, 32. Animal advocates who approach the subject from more of a welfare view, rather than a rights view, are more likely to be open to zoos 46.

Some zoos are ethically run, and some are not. Factors in an ethically run zoo include sufficient space for animals that mimics natural habitat, meeting of animals' physical needs, avoidance of animal tricks and limited animal exposure to the public, and the conduct of research or conservation activities 47. In a well-run zoo, animals tend to have longer lives and better satisfaction of physical needs than their wild counterparts, but other aspects of their well-being are hard to assess 48.

References

  1. Ananthanarayanan, R., Esser, S., Simon, H., Modha, D. "The cat is out of the bag: cortical simulations with 109 neurons, 1013 synapses". In Proceedings of the conference on high performance computing networking, storage and analysis, pp. 1-12. November 2009. ↩

  2. anthropology.net. "A Strange Approach to Social Interaction, and Butterflies". January 2007. ↩

  3. Azevedo, F., Carvalho, L., Grinberg, L., Farfel, J. M., Ferretti, R., Leite, R., Filho, W. J., Lent, R., Herculano‐Houzel, S. "Equal numbers of neuronal and nonneuronal cells make the human brain an isometrically scaled‐up primate brain". Journal of Comparative Neurology 513(5), pp. 532-541. April 2009. ↩

  4. Bode, H., Berking, S., David, C. N., Gierer, A., Schaller, H., Trenkner, E. "Quantitative analysis of cell types during growth and morphogenesis in Hydra". Wilhelm Roux' Archiv für Entwicklungsmechanik der Organismen 173, pp. 269–285. December 1973. ↩

  5. Cash, D., Carew, T. "A quantitative analysis of the development of the central nervous system in juvenile Aplysia californica". Journal of Neurobiology 20(1), pp. 25-47. January 1989. ↩

  6. Herculano-Houzel, S., Avelino-de-Souza, K., Neves, K., Porfírio, J., Messeder, D., Feijó, L. M., Maldonado, J., Manger, P. "The elephant brain in numbers". Frontiers in Neuroanatomy 8(46). June 2014. ↩

  7. Herculano-Houzel, S., Kaas, J. H. "Gorilla and Orangutan Brains Conform to the Primate Cellular Scaling Rules: Implications for Human Evolution". Brain, Behavior and Evolution 77, pp. 33-44. 2011. ↩

  8. Herculano-Houzel, S., Mota, B., Lent, R. "Cellular scaling rules for rodent brains". Proceedings of the National Academy of Sciences of the United States of America 103(32), pp. 12138-12143. August 2006. ↩

  9. Herculano‐Houzel, S., da Cunha, F. B., Reed, J. L., Kaswera‐Kyamakya, C., Gillissen, E., Manger, P. R. "Microchiropterans have a diminutive cerebral cortex, not an enlarged cerebellum, compared to megachiropterans and other mammals". Journal of Comparative Neurology 528(17), pp.2978-2993. December 2020. ↩

  10. Hinsch, K., Zupanc, G. K. H. "Generation and long-term persistence of new neurons in the adult zebrafish brain: A quantitative analysis". Neuroscience 146(2), pp. 679-696. May 2007. ↩

  11. Hofman, M., Falk, D., editors. "Evolution of the primate brain: from neuron to behavior 195". Elsevier Science, ISBN-13 : 978-0444602275. March 2012. ↩

  12. Jardim-Messeder, D., Lambert, K., Noctor, S., Pestana, F., de Castro Leal, M., Bertelsen, M., Aligaili, A., Mohammad, O., Manger, P., Herculano-Houzel, S. "Dogs Have the Most Neurons, Though Not the Largest Brain: Trade-Off between Body Mass and Number of Neurons in the Cerebral Cortex of Large Carnivoran Species". Frontiers in Neuroanatomy 11(118). December 2017. ↩

  13. Kazu, R., Maldonado, J., Mota, B., Manger, P., Herculano-Houzel, S. "Corrigendum: Cellular scaling rules for the brain of Artiodactyla include a highly folded cortex with few neurons". Frontiers in Neuroanatomy 8(128). November 2014. ↩

  14. Martin, C., Gross, V., Hering, L., Tepper, B., Jahn, H., de Sena Oliveira, I., Stevenson, P. A., Mayer, G. "The nervous and visual systems of onychophorans and tardigrades: learning about arthropod evolution from their closest relatives". Journal of Comparative Physiology A 203, pp. 565-590. June 2017. ↩

  15. neurocomputing.org. "Frog Brain Neuron Number". Accessed January 30, 2021. ↩

  16. Olkowicz, S., Kocourek, M., Lučan, R., Porteš, M., Fitch, T., Herculano-Houzel, S., Němec, P. "Birds have primate-like numbers of neurons in the forebrain". Proceedings of the National Academy of Sciences of the United States of America 113(26), pp. 7225-7260. June 2016. ↩

  17. Salajková, V. "Pravidla buněčného škálování mozku u psů: Efekt domestikace a miniaturizace psích plemen (Cellular scaling rules for dog brains: Effect of domestication and miniaturization of dog breeds)". Diploma thesis, Department of Zoology, Charles University. March 2020. ↩

  18. Sherwood, L., Klandorf, H., Yancey, P. Animal Physiology: From Genes to Organisms. Cengage Learning, p. 150. ISBN 9781133709510. 2012. ↩

  19. Tefl, J., Tefl, S. "Interesting Facts about Ants". 1996. ↩

  20. The Lobster Institute. "Anatomy & Biology". University of Maine. Accessed January 30, 2021. ↩

  21. University of Washington. "Brain Facts and Figures". Accessed January 30, 2021. ↩ ↩2

  22. White, J. G., Southgate, E., Thomson, J. N., Brenner, S. "The structure of the nervous system of the nematode Caenorhabditis elegans". Philosophical Transactions of the Royal Society B 314(1165), pp. 1-340. November 1986. ↩

  23. Dicke, U., Roth, G. "Neuronal factors determining high intelligence". Philosophical Transactions of the Royal Society B: Biological Sciences 371(1685): 20150180. January 2016. ↩

  24. Fraser, D., MacRae, A. M. "Four Types of Activities that Affect Animals: Implications for Animal Welfare Science and Animal Ethics Philosophy". Animal Welfare 20(4), pp. 581-590. November 2011. ↩ ↩2

  25. Clark, S. "The rights of Wild things". Inquiry 22(1-4), pp. 171-188. January 1979. ↩

  26. Cowen, T. "Policing Nature". Environmental Ethics 25(2), pp. 169-182. Summer 2003. ↩

  27. Fraser, C. "The Crucial Role of Predators: A New Perspective on Ecology". Yale Environment 360. September 2011. ↩

  28. Hargrove, E. "The Animal Rights/Environmental Ethics Debate: The Environmental Perspective". SUNY Press, ISBN 0791409333, 9780791409336. January 1992. ↩

  29. Kapembwa, J. "Predation Catch-22: Disentangling the Rights of Prey, Predators, and Rescuers". Journal of Agricultural and Environmental Ethics 31, pp. 527-542. August 2018. ↩

  30. McMahan, J. "The Meat Eaters". The New York Times, Opinionater. September 2010. ↩

  31. Pearce, D. "Reprogramming Predators - Blueprint for a Cruelty-Free World". 2009. ↩

  32. Regan, T. "The case for animal rights". Berkeley: University of California Press. 1983. ↩ ↩2

  33. Hettinger, N. "Valuing Predation in Rolston's Environmental Ethics: Bambi Lovers versus Tree Huggers". Environmental Ethics 16(1), pp. 3-20. February 1994. ↩

  34. Sapontzis, S. "Predation". Ethics and Animals 5(2): 4. 1984. ↩

  35. Singer, P. "Food for Thought". The New York Review. June 1973. ↩

  36. Dawkins, R. "River Out of Eden: A Darwinian View of Life (Science Masters Series)". Basic Books; Reprint edition, ISBN-13 : 978-1857994056. 1995. ↩

  37. Faria, C., Horta, O. Welfare Biology. In The Routledge Handbook of Animal Ethics, ISBN 9781315105840. 2019. ↩

  38. Ng, Y. "Towards welfare biology: Evolutionary economics of animal consciousness and suffering". Biology and Philosophy 10(3), pp. 255-285. July 1995. ↩

  39. Abbott, R. "Wildlife Vaccination - Growing in Feasibility?". Cornell Wildlife Health Lab. February 2020. ↩

  40. Saja, K. "The moral footprint of animal products". Agriculture and Human Values 30(2), pp. 193-202. June 2013. ↩ ↩2

  41. Keulartz, J. "Captivity for Conservation? Zoos at a Crossroads". Journal of Agricultural and Environmental Ethics 28(2), pp. 335-351. April 2015. ↩

  42. DeGrazia, D. "The Ethics of Confining Animals: From Farms to Zoos to Human Homes". In Tom Beauchamp & R. G. Frey (eds.), The Oxford Handbook of Animal Ethics. Oxford: Oxford University Press. 2011. ↩

  43. Kuehn, B. "Is it ethical to keep animals in zoos?". American Veterinary Medical Association. November 2002. ↩

  44. Singer, P. Animal Liberation: The Definitive Classic of the Animal Movement. Harper Perennial Modern Classics; Updated ed. edition (February 24, 2009), ISBN-13 : 978-0061711305. 1975. ↩

  45. Malamud, R. "Reading Zoos: Representations of Animals and Captivity". New York University Press. 1998. ↩

  46. Kreger, M., Hutchins, M. "Ethics of keeping mammals in zoos and aquariums". In book: Wild Mammals in Captivity: Principles & Techniques for Zoo Management (pp. 3-10), Edition: 2nd, Publisher: University of Chicago Press: Chicago, ILEditors: D. Kleiman, K.V. Thompson, C.K. Baer. January 2010. ↩

  47. Schuttler, S. "Ethical Zoos: How to Determine the Good from the Bad". March 2020. ↩

  48. Wickins-Dražilová, D. "Zoo Animal Welfare". Journal of Agricultural and Environmental Ethics 19, pp. 27-36. February 2006. ↩