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Public attitudes towards grief in animals

Published online by Cambridge University Press:  01 January 2023

N McGrath
Affiliation:
The Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, Roslin, Midlothian EH25 9RG, UK Centre for Animal Welfare and Ethics, School of Veterinary Science, University of Queensland, Gatton 4343, QLD, Australia
J Walker
Affiliation:
Centre for Animal Welfare and Ethics, School of Veterinary Science, University of Queensland, Gatton 4343, QLD, Australia
D Nilsson
Affiliation:
Centre for Animal Welfare and Ethics, School of Veterinary Science, University of Queensland, Gatton 4343, QLD, Australia
C Phillips*
Affiliation:
Centre for Animal Welfare and Ethics, School of Veterinary Science, University of Queensland, Gatton 4343, QLD, Australia
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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Animals under human management are often separated from conspecifics, which may lead to behaviour indicative of separation distress or grief. For the purposes of this paper, grief is considered as a biological response to separation, indicated by a bi-phasic ‘protest-despair’ behavioural response. It is reasonable to assume that only animals which are able to form complex social bonds can experience grief. Scientific experiments have suggested that some farm and laboratory animals experience distress or grief as a result of maternal separation and social isolation. However, little is known about whether the public believe that animals are capable of grief. Therefore, we surveyed 1,000 members of the public to establish what knowledge they have about grief in animals and to compare this to what we know in science. The survey revealed that 90% of the general public believed that some or all animals can experience grief, with 23% believing that all animals can grieve. They attributed grief more to companion animals and animals with higher level cognitive abilities than to farm animals and animals that may be feared. It is concluded that public belief about grief in animals extends beyond scientific evidence, and that educating people about scientific findings and management practices connected with grief and separation distress may improve the welfare of farm and laboratory animals.

Type
Research Article
Copyright
© 2013 Universities Federation for Animal Welfare

References

ABS 2011 Australian Bureau of Statistics. National Regional Profile: Brisbane (Statistical Division). Population. Viewed 11 June 2011. http://www.abs.gov.au/AUSSTATS/[email protected]/latestproducts/305Population/People12006-2010?opendocument&tabname=Summary&prodno=305&issue=2006-2010Google Scholar
Archer, J 1999 The Nature of Grief: The Evolution and Psychology of Reactions to Loss. Routledge: London, UKGoogle Scholar
Averill, JR 1968 Grief: its nature and significance. Psychological Bulletin 70: 721748. http://dx.doi.org/10.1037/h0026824CrossRefGoogle ScholarPubMed
Barclay, RMR, Fenton, MB and Thomas, DW 1979 Social-behavior of the little brown bat, Myotis lucifugus. Behavioral Ecology and Sociobiology 6: 137146. http://dx.doi.org/10.1007/BF00292560CrossRefGoogle Scholar
Bard, KA and Nadler, RD 1983 The effect of peer separation in young chimpanzees (Pan troglodytes). American Journal of Primatology 5: 2537. http://dx.doi.org/10.1002/ajp.1350050104CrossRefGoogle Scholar
Bates, LA, Poole, JH and Byrne, RW 2008 Elephant cognition. Current Biology 18: R544R546. http://dx.doi.org/10.1016/j.cub. 2008.04.019CrossRefGoogle ScholarPubMed
Bekoff, M 2007 The Emotional Lives of Animals. New World Library: Novato, USAGoogle Scholar
Berridge, KC and Kringelbach, ML 2008 Affective neuroscience of pleasure: reward in humans and animals. Psychopharmacology 199: 457480. http://dx.doi.org/10.1007/s00 213-008-1099-6CrossRefGoogle ScholarPubMed
Boccia, ML, Scanlan, JM, Laudenslager, ML, Berger, CL, Hijazi, AS and Reite, ML 1997 Juvenile friends, behavior, and immune responses to separation in bonnet macaque infants. Physiology & Behavior 61: 191198. http://dx.doi.org/10.1016/S003 1-9384(96)00370-8CrossRefGoogle ScholarPubMed
Boissy, A and Le Neindre, P 1997 Behavioral, cardiac and cortisol responses to brief peer separation and reunion in cattle. Physiology & Behavior 61: 693699. http://dx.doi.org/10.1016/S0031-9384(96)00521-5CrossRefGoogle ScholarPubMed
Bos, N, Lefevre, T, Jensen, AB and d’Ettorre, P 2012 Sick ants become unsociable. Journal of Evolutionary Biology 25: 342351. http://dx.doi.org/10.1111/j.1420-9101.2011.02425.xCrossRefGoogle ScholarPubMed
Bouissou, M-F, Boissy, A, Le Neindre, P and Veissier, I 2001 The social behaviour of cattle. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 113145. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780 851993973.0113CrossRefGoogle Scholar
Bowlby, J 1958 The nature of the child's tie to his mother. International Journal of Psycho-Analysis 39: 350373Google ScholarPubMed
Bowlby, J 1960 Grief and mourning in infancy and early-childhood. Psychoanalytic Study of the Child 15: 952CrossRefGoogle Scholar
Bowlby, J 1961 Processes of mourning. International Journal of Psychoanalysis 42: 317340Google ScholarPubMed
Brown, ED and Farabaugh, SM 1997 What birds with complex social relationships can tell us about vocal learning: vocal sharing in avian groups. In: Snowdon, C and Hausberger, M (eds) Social Influences on Vocal Development pp 98127. Cambridge University Press: Cambridge, UK. http://dx.doi.org/10.1017/CBO97805 11758843.007CrossRefGoogle Scholar
Burgdorf, J and Panksepp, J 2006 The neurobiology of positive emotions. Neuroscience and Biobehavioral Reviews 30: 173187. http://dx.doi.org/10.1016/j.neubiorev.2005.06.001CrossRefGoogle ScholarPubMed
Burghardt, G 1977 Of iguanas and dinosaurs: social behaviour and communication in neonate reptiles. American Zoologist 17: 177190CrossRefGoogle Scholar
Burghardt, G 2007 Critical anthropomorphism, uncritical anthropomorphism and naive nominalism. Comparative Cognitive Behavior Reviews 2: 136138Google Scholar
Byrne, RW, Bates, LA and Moss, CJ 2009 Elephant cognition in primate perspective. Comparative Cognition & Behavior Reviews 4: 6579CrossRefGoogle Scholar
Cabanac, M 1999 Emotion and Phylogeny. Japanese Journal of Physiology 49: 110. http://dx.doi.org/10.2170/jjphysiol.49.1Google ScholarPubMed
Call, J and Tomasello, M 2008 Does the chimpanzee have a theory of mind? 30 years later. Trends in Cognitive Sciences 12: 187192. http://dx.doi.org/10.1016/j.tics.2008.02.010CrossRefGoogle ScholarPubMed
Carbonaro, DA, Friend, TH, Dellmeier, GR and Nuti, LC 1992 Behavioral and physiological responses of dairy goats to isolation. Physiology & Behavior 51: 297301. http://dx.doi.org/10.1016/0031-9384(92)90144-QCrossRefGoogle Scholar
Cockram, MS, Ranson, M, Imlah, P, Goddard, PJ, Burrells, C and Harkiss, GD 1994 The behavioural, endocrine and immune responses of sheep to isolation. Animal Production 58: 389399. http://dx.doi.org/10.1017/S0003356100007339Google Scholar
Codner, MA and Nadler, RD 1984 Mother-infant separation and reunion in the great apes. Primates 25: 204217. http://dx.doi.org/10.1007/BF02382392CrossRefGoogle Scholar
Cronin, KA, van Leeuwen, EJC, Mulenga, IC and Bodamer, MD 2011 Behavioral response of a chimpanzee mother toward her dead infant. American Journal of Primatology 73: 415421. http://dx.doi.org/10.1002/ajp.20927CrossRefGoogle ScholarPubMed
Crowell-Davis, SL, Curtis, TM and Knowles, RJ 2004 Social organization in the cat: a modern understanding. Journal of Feline Medicine and Surgery 6: 1928. http://dx.doi.org/10.1016/j.jfms.2003.09.013CrossRefGoogle ScholarPubMed
Cryan, JF, Mombereau, C and Vassout, A 2005 The tail suspension test as a model for assessing antidepressant activity: review of pharmacological and genetic studies in mice. Neuroscience & Biobehavioral Reviews 29: 571625. http://dx.doi.org/10.1016/j.neubiorev.2005.03.009CrossRefGoogle ScholarPubMed
Damasio, AR, Grabowski, TJ, Bechara, A, Damasio, H, Ponto, LLB, Parvizi, J and Hichwa, RD 2000 Subcortical and cortical brain activity during the feeling of self-generated emotions. Nature Neuroscience 3: 10491056. http://dx.doi.org/10.1038/79871CrossRefGoogle ScholarPubMed
D’Aquila, PS, Brain, P and Willner, P 1994 Effects of chronic mild stress on performance in behavioural tests relevant to anxiety and depression. Physiology & Behavior 56: 861867. http://dx.doi.org/10.1016/0031-9384(94)90316-6CrossRefGoogle ScholarPubMed
Davey, GCL, McDonald, AS, Hirisave, U, Prabhu, GG, Iwawaki, S, Jim, CI, Merckelbach, H, de Jong, PJ, Leung, PWL and Reimann, BC 1998 A cross-cultural study of animal fears. Behaviour Research and Therapy 36: 735750. http://dx.doi.org/10.1016/S0005-7967(98)00059-XCrossRefGoogle ScholarPubMed
David, DJ, Samuels, BA, Rainer, Q, Wang, J-W, Marsteller, D, Mendez, I, Drew, M, Craig, DA, Guiard, BP, Guilloux, J-P, Artymyshyn, RP, Gardier, AM, Gerald, C, Antonijevic, IA, Leonardo, ED and Hen, R 2009 Neurogenesis-dependent and independent effects of fluoxetine in an animal model of anxiety/depression. Neuron 62: 479493. http://dx.doi.org/10.1016/j.neuron.2009.04.017CrossRefGoogle Scholar
Denault, LK and McFarlane, DA 1995 Reciprocal altruism between male vampire bats, Desmodus rotundus. Animal Behaviour 49: 855856CrossRefGoogle Scholar
De Vaus, DA 2002 Surveys in Social Research. Allen & Unwin: Sydney, AustraliaCrossRefGoogle Scholar
Douglas-Hamilton, I, Bhalla, S, Wittemyer, G and Vollrath, F 2006 Behavioural reactions of elephants towards a dying and deceased matriarch. Applied Animal Behaviour Science 100: 87102. http://dx.doi.org/10.1016/j.applanim.2006.04.014CrossRefGoogle Scholar
Eddy, TJ, Gallup, GG and Povinelli, DJ 1993 Attribution of cognitive states to animals. Anthropomorphism in comparative perspective. Journal of Social Issues 49: 87101. http://dx.doi.org/10.1111/j.1540-4560.1993.tb00910.xCrossRefGoogle Scholar
Enriquez, D, Hotzel, MJ and Ungerfeld, R 2011 Minimising the stress of weaning of beef calves: a review. Acta Veterinaria Scandinavica 53: 28. http://dx.doi.org/10.1186/1751-0147-53-28CrossRefGoogle ScholarPubMed
Fertl, D and Schiro, A 1994 Carrying of dead calves by freeranging Texas bottlenose dolphins (Tursiops truncatus). Aquatic Mammals 20: 5356Google Scholar
Fisher, A and Matthews, L 2001 The social behaviour of sheep. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 211245. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780851993973.0211CrossRefGoogle Scholar
Flannigan, G and Dodman, NH 2001 Risk factors and behaviors associated with separation anxiety in dogs. Journal of the American Veterinary Medical Association 219: 460466. http://dx.doi.org/10.2460/javma.2001.219.460CrossRefGoogle ScholarPubMed
Flower, FC and Weary, DM 2003 The effects of early separation on the dairy cow and calf. Animal Welfare 12: 339348Google Scholar
Gonyou, HW 2001 The social behaviour of pigs. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 147176. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780851993973.0147CrossRefGoogle Scholar
Granek, L 2010 Grief as pathology: the evolution of grief theory in psychology from Freud to the present. History of Psychology 13: 4673. http://dx.doi.org/10.1037/a0016991CrossRefGoogle ScholarPubMed
Guesdon, V, Ligout, S, Delagrange, P, Spedding, M, Levy, F, Laine, A-L, Malpaux, B and Chaillou, E 2012 Multiple exposures to familiar conspecific withdrawal is a novel robust stress paradigm in ewes. Physiology & Behavior 105: 203208. http://dx.doi.org/10.1016/j.physbeh.2011.08.011CrossRefGoogle ScholarPubMed
Haber, SN and Knutson, B 2010 The reward circuit: linking primate anatomy and human imaging. Neuropsychopharmacology 35: 426. http://dx.doi.org/10.1038/npp.2009.129CrossRefGoogle ScholarPubMed
Harrison, MA 2010 Anthropomorphism, empathy, and perceived communicative ability vary with phylogenetic relatedness to humans. Journal of Social, Evolutionary, and Cultural Psychology 4: 3448CrossRefGoogle Scholar
Hennessy, MB 1997 Hypothalamic-pituitary-adrenal responses to brief social separation. Neuroscience and Biobehavioral Reviews 21: 1129. http://dx.doi.org/10.1016/S0149-7634(96)00013-9CrossRefGoogle ScholarPubMed
Herzing, DL 2000 A trail of grief. In: Bekoff, M (ed) The Smile of a Dolphin: Remarkable Accounts of Animal Emotions. Random House: New York, USAGoogle Scholar
Herzog, HA 2007 Gender differences in human-animal interactions: a review. Anthrozoös 20: 721. http://dx.doi.org/10.2752/089279307780216687CrossRefGoogle Scholar
Hills, AM 1993 The motivational bases of attitudes toward animals. Society & Animals 1: 111128. http://dx.doi.org/10.1163/156853093X00028CrossRefGoogle Scholar
Hofer, MA 1984 Relationships as regulators: a psychobiologic perspective on bereavement. Psychosomatic Medicine 46: 183197CrossRefGoogle ScholarPubMed
Hofer, MA 2006 Psychobiological roots of early attachment. Current Directions in Psychological Science 15: 8488. http://dx.doi.org/10.1111/j.0963-7214.2006.00412.xCrossRefGoogle Scholar
Hopster, H, O’ Connell, JM and Blokhuis, HJ 1995 Acute effects of cow-calf separation on heart rate, plasma cortisol and behaviour in multiparous dairy cows. Applied Animal Behaviour Science 44: 18. http://dx.doi.org/10.1016/0168-1591(95)00581-CCrossRefGoogle Scholar
Jasper, J, Budzynska, M and Weary, DM 2008 Weaning distress in dairy calves: acute behavioural responses by limit-fed calves. Applied Animal Behaviour Science 110: 136143. http://dx.doi.org/10.1016/j.applanim.2007.03.017CrossRefGoogle Scholar
Jensen, P 2001 Parental behaviour. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 5981. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780851993973.0059CrossRefGoogle Scholar
Kaplan, G 2004 Australian magpie: biology and behaviour of an unusual songbird. CSIRO Publishing: AustraliaCrossRefGoogle Scholar
Kellert, SR 1985 Public perceptions of predators, particularly the wolf and coyote. Biological Conservation 31: 167189. http://dx.doi.org/10.1016/0006-3207(85)90047-3CrossRefGoogle Scholar
Kent, JP 1987 Experiments on the relationship between the hen and the chick (Gallus gallus): the role of the auditory mode in recognition and the effects of maternal separation. Behaviour 102: 114. http://dx.doi.org/10.1163/156853986X00018CrossRefGoogle Scholar
Knight, S, Vrij, A, Cherryman, V and Nunkoosing, K 2004 Attitudes towards animal use and belief in animal mind. Anthrozoös 17: 4362.http://dx.doi.org/10.2752/089279304786991945CrossRefGoogle Scholar
Konok, V, Doka, A and Miklosi, A 2011 The behavior of the domestic dog (Canis familiaris) during separation from and reunion with the owner: a questionnaire and an experimental study. Applied Animal Behaviour Science 135: 300308. http://dx.doi.org/10.1016/j.applanim.2011.10.011CrossRefGoogle Scholar
Kraemer, GW 1992 A psychobiological theory of attachment. Behavioral and Brain Sciences 15: 493-541. http://dx.doi.org/10.1017/S0140525X00069752CrossRefGoogle Scholar
Kruse, CR 1999 Gender, views of nature, and support for animal rights. Society & Animals 7: 179198. http://dx.doi.org/10.1163/156853099X00077CrossRefGoogle Scholar
Kuczaj SA, II, Gory, JD and Xitco, MJ Jr 2009 How intelligent are dolphins? A partial answer based on their ability to plan their behavior when confronted with novel problems. Japanese Journal of Animal Psychology 59: 99115. http://dx.doi.org/10.2502/j anip.59.1.9CrossRefGoogle Scholar
Laudenslager, ML, Held, PE, Boccia, ML, Reite, ML and Cohen, JJ 1990 Behavioral and immunological consequences of brief mother-infant separation: a species comparison. Developmental Psychobiology 23: 247264. http://dx.doi.org/10.1002/dev.420230305CrossRefGoogle ScholarPubMed
Lawrence, AB 2008 Applied animal behaviour science: past, present and future prospects. Applied Animal Behaviour Science 115: 124. http://dx.doi.org/10.1016/j.applanim.2008.06.003CrossRefGoogle Scholar
Lee, PC 1987 Allomothering among African elephants. Animal Behaviour 35: 278291. http://dx.doi.org/10.1016/S0003-3472(87)80234-8CrossRefGoogle Scholar
Loberg, JM, Hernandez, CE, Thierfelder, T, Jensen, MB, Berg, C and Lidfors, L 2008 Weaning and separation in two steps: a way to decrease stress in dairy calves suckled by foster cows. Applied Animal Behaviour Science 111: 222234. http://dx.doi.org/10.1016/j.applanim.2007.06.011CrossRefGoogle Scholar
Lund, JD and Jorgensen, MC 1999 Behaviour patterns and time course of activity in dogs with separation problems. Applied Animal Behaviour Science 63: 219236. http://dx.doi.org/10.1016/S0168-1591(99)00011-8CrossRefGoogle Scholar
Lyons, DM, Price, EO and Moberg, GP 1993 Social grouping tendencies and separation-induced distress in juvenile sheep and goats. Developmental Psychobiology 26: 251259. http://dx.doi.org/10.1002/dev.420260503CrossRefGoogle ScholarPubMed
Mann, J and Smuts, BB 1998 Natal attraction: allomaternal care and mother-infant separations in wild bottlenose dolphins. Animal Behaviour 55: 10971113. http://dx.doi.org/10.1006/anbe.1997.0637CrossRefGoogle ScholarPubMed
Mann, J and Smuts, BB 1999 Behavioral development in wild bottlenose dolphin newborns (Tursiops spp). Behaviour 136: 529566. http://dx.doi.org/10.1163/156853999501469Google Scholar
Marchant-Forde, JN, Marchant-Forde, RM and Weary, DM 2002 Responses of dairy cows and calves to each other's vocalisations after early separation. Applied Animal Behaviour Science 78: 1928. http://dx.doi.org/10.1016/S0168-1591(02)00082-5CrossRefGoogle Scholar
Marx, G, Leppelt, J and Ellendorff, F 2001 Vocalisation in chicks (Gallus gallus) during stepwise social isolation. Applied Animal Behaviour Science 75: 6174. http://dx.doi.org/10.1016/S0168-1591(01)00180-0CrossRefGoogle Scholar
Matsumura, S 1981 Mother-infant communication in a horseshoe bat (Rhinolophus ferrumequinum nippon): vocal communication in 3 week-old infants. Journal of Mammalogy 62: 2028. http://dx.doi.org/10.2307/1380474CrossRefGoogle Scholar
Mazur, N 2006 Social research to support the Australian animal welfare strategy. ENVision Environmental Consulting: AustraliaGoogle Scholar
McGreevy, PD and Nicholas, FW 1999 Some practical solutions to welfare problems in dog breeding. Animal Welfare 8: 329341Google Scholar
Mench, J and Keeling, L 2001 The social behaviour of domestic birds. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 177209. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780851993973.0177CrossRefGoogle Scholar
Mendl, M, Brooks, J, Basse, C, Burman, O, Paul, E, Blackwell, E and Casey, R 2010 Dogs showing separation-related behaviour exhibit a ‘pessimistic’ cognitive bias. Current Biology 20: R839R840. http://dx.doi.org/10.1016/j.cub.2010.08.030CrossRefGoogle ScholarPubMed
Mercado III, E and De Long, C 2010 Dolphin cognition: representations and processes in memory and perception. International Journal of Comparative Psychology 23: 344378Google Scholar
Metz, JHM and Gonyou, HW 1990 Effect of age and housing conditions on the behavioral and hemolytic reaction of piglets to weaning. Applied Animal Behaviour Science 27: 299-309. http://dx.doi.org/10.1016/0168-1591(90)90126-XCrossRefGoogle Scholar
Mineka, S and Suomi, SJ 1978 Social separation in monkeys. Psychological Bulletin 85: 13761400. http://dx.doi.org/10.1037/0033-2909.85.6.1376CrossRefGoogle ScholarPubMed
Morris, P, Doe, C and Godsell, E 2008 Secondary emotions in non-primate species? Behavioural reports and subjective claims by animal owners. Cognition & Emotion 22: 320. http://dx.doi.org/10.1080/02699930701273716CrossRefGoogle Scholar
Newberry, R and Swanson, J 2001 Breaking social bonds. In: Keeling, LJ and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 307331. CABI Publishing: Wallingford, UK. http://dx.doi.org/10.1079/9780851993973.0307CrossRefGoogle Scholar
Newberry, R and Swanson, J 2008 Implications of breaking mother-young social bonds. Applied Animal Behaviour Science 110: 323. http://dx.doi.org/10.1016/j.applanim.2007.03.021CrossRefGoogle Scholar
Norcross, JL and Newman, JD 1999 Effects of separation and novelty on distress vocalizations and cortisol in the common marmoset (Callithrix jacchus). American Journal of Primatology 47: 209222. http://dx.doi.org/10.1002/(SICI) 1098-2345(1999)47:3<209:: AID-AJP3>3.0.CO;2-03.0.CO;2-0>CrossRefGoogle Scholar
Orgeur, P, Bernard, S, Naciri, M, Nowak, R, Schaal, B and Levy, F 1999 Psychobiological consequences of two different weaning methods in sheep. Reproduction Nutrition Development 39: 231244. http://dx.doi.org/10.1051/rnd:19990208CrossRefGoogle ScholarPubMed
Panksepp, J 1998 Affective Neuroscience: The Foundations of Human and Animal Emotions. Oxford University Press: Oxford, UKGoogle Scholar
Panksepp, J 2011 Toward a cross-species neuroscientific understanding of the affective mind: do animals have emotional feelings? American Journal of Primatology 73: 545561. http://dx.doi.org/10.1002/ajp.20929CrossRefGoogle Scholar
Panksepp, J, Vilberg, T, Bean, NJ, Coy, DH and Kastin, AJ 1978 Reduction of distress vocalizations in chicks by opiate-like peptides. Brain Research Bulletin 3: 663667. http://dx.doi.org/10.1016/0361-9230(78)90014-XCrossRefGoogle ScholarPubMed
Panksepp, J and Watt, D 2011 Why does depression hurt? Ancestral primary-process separation-distress (PANIC/GRIEF) and diminished brain reward (SEEKING) processes in the genesis of depressive affect. Psychiatry 74: 513. http://dx.doi.org/10.1521/psyc.2011.74.1.5CrossRefGoogle ScholarPubMed
Paul, IA, English, JA and Halaris, A 2000 Sucrose and quinine intake by maternally deprived and control rhesus monkeys. Behavioural Brain Research 112: 127134. http://dx.doi.org/10.1016/S0166-4328(00)00173-XCrossRefGoogle ScholarPubMed
Payne, K 2003 Sources of social complexity in the three elephant species. In: de Waal, FBM and Tyack, PL (eds) Animal Social Complexity: Intelligence, Culture and Individualized Societies pp 5785. Harvard University Press: Cambridge, MA, USACrossRefGoogle Scholar
Phillips, C, Izmirli, S, Aldavood, J, Alonso, M, Choe, B, Hanlon, A, Handziska, A, Illmann, G, Keeling, L, Kennedy, M, Lee, G, Lund, V, Mejdell, C, Pelagic, V and Rehn, T 2010 An international comparison of female and male students’ attitudes to the use of animals. Animals 1: 726. http://dx.doi.org/10.3390/ani1010007CrossRefGoogle Scholar
Pifer, L, Shimizu, K and Pifer, R 1994 Public attitudes toward animal research: some international comparisons. Society & Animals 2: 95113. http://dx.doi.org/10.1163/156853094X00126CrossRefGoogle ScholarPubMed
Rasmussen, JL 1995 Differences and similarities in humans’ perceptions of the thinking and feeling of a dog and a boy. Society & Animals 3: 117137. http://dx.doi.org/10.1163/156853095X00116CrossRefGoogle Scholar
Rault, JL, Boissy, A and Boivin, X 2011 Separation distress in artificially reared lambs depends on human presence and the number of conspecifics. Applied Animal Behaviour Science 132: 4250. http://dx.doi.org/10.1016/j.applanim.2011.02.011CrossRefGoogle Scholar
Reinhardt, V and Reinhardt, A 1981 Natural sucking performance and age of weaning in Zebu cattle (Bos indicus). Journal of Agricultural Science 96: 309312. http://dx.doi.org/10.1017/S0021859600066089CrossRefGoogle Scholar
Reite, M, Kaemingk, K and Boccia, ML 1989 Maternal separation in bonnet monkey infants: altered attachment and social support. Child Development 60: 473480. http://dx.doi.org/10.2307/1130991CrossRefGoogle ScholarPubMed
Rose, N 2000 A death in the family. In: Bekoff, M (ed) The Smile of a Dolphin: Remarkable Accounts of Animal Emotions. Random House/Discovery Books: New York, USAGoogle Scholar
Rushen, J, Boissy, A, Terlouw, EMC and de Passillé, AMB 1999 Opioid peptides and behavioral and physiological responses of dairy cows to social isolation in unfamiliar surroundings. Journal of Animal Science 77: 29182924CrossRefGoogle ScholarPubMed
Schlegel, J and Rupf, R 2010 Attitudes towards potential animal flagship species in nature conservation: a survey among students of different educational institutions. Journal for Nature Conservation 18: 278290. http://dx.doi.org/10.1016/j.jnc.2009.12.002CrossRefGoogle Scholar
Schwartz, S 2003 Separation anxiety syndrome in dogs and cats. Journal of the American Veterinary Medical Association 222: 15261532. http://dx.doi.org/10.2460/javma.2003.222.1526CrossRefGoogle ScholarPubMed
Seay, B, Hansen, E and Harlow, HF 1962 Mother-infant separation in monkeys. Journal of Child Psychology and Psychiatry and Allied Disciplines 3: 123132. http://dx.doi.org/10.1111/j.1469-7610.1962.tb02047.xCrossRefGoogle ScholarPubMed
Serpell, JA 2003 Anthropomorphism and anthropomorphic selection: beyond the ‘cute response’. Society & Animals 11: 83100. http://dx.doi.org/10.1163/156853003321618864CrossRefGoogle Scholar
Serpell, JA 2004 Factors influencing human attitudes to animals and their welfare. Animal Welfare 13: S145S151Google Scholar
Shih, T-H and Fan, X 2008 Comparing response rates from web and mail surveys: a meta-analysis. Field Methods 20: 249271. http://dx.doi.org/10.1177/1525822X08317085CrossRefGoogle Scholar
Siebert, K, Langbein, J, Schoen, P-C, Tuchscherer, A and Puppe, B 2011 Degree of social isolation affects behavioural and vocal response patterns in dwarf goats (Capra hircus). Applied Animal Behaviour Science 131: 5362. http://dx.doi.org/10.1016/j.applanim.2011.0I.003CrossRefGoogle Scholar
Signal, TD and Taylor, N 2006 Attitudes to animals: demographics within a community sample. Society & Animals 14: 147157. http://dx.doi.org/10.1163/156853006776778743Google Scholar
Simmonds, MP 2006 Into the brains of whales. Applied Animal Behaviour Science 100: 103116. http://dx.doi.org/10.1016/j.applanim.2006.04.015CrossRefGoogle Scholar
Smith, D, Trennery, P, Farningham, D and Klapwijk, J 2001 The selection of marmoset monkeys (Callithrix jacchus) in pharmaceutical toxicology. Laboratory Animals 35: 117130. http://dx.doi.org/10.1258/0023677011911444CrossRefGoogle Scholar
Smolker, RA, Richards, AF, Connor, RC and Pepper, JW 1992 Sex differences in patterns of association among Indian–Ocean bottlenose dolphins. Behaviour 123: 3869. http://dx.doi.org/10.1163/156853992X00101CrossRefGoogle Scholar
Soares, GM, Pereira, JT and Paixao, RL 2010 Exploratory study of separation anxiety syndrome in apartment dogs. Ciencia Rural 40: 548553. http://dx.doi.org/10.1590/S0103-84782010000300008CrossRefGoogle Scholar
Stroebe, M, Schut, H and Stroebe, W 2007 Health outcomes of bereavement. Lancet 370: 19601973. http://dx.doi.org/10.1016/S0140-6736(07)61816-9CrossRefGoogle ScholarPubMed
Suomi, SJ 1983 Models of depression in primates. Psychological Medicine 13: 465468. http://dx.doi.org/10.1017/S0033291700047887CrossRefGoogle ScholarPubMed
Taylor, N and Signal, TD 2005 Empathy and attitudes to animals. Anthrozoös 18: 1827. http://dx.doi.org/10.2752/089279305785594342CrossRefGoogle Scholar
Topal, J, Gacsi, M, Miklosi, A, Viranyi, Z, Kubinyi, E and Csanyi, V 2005 Attachment to humans: a comparative study on hand-reared wolves and differently socialized dog puppies. Animal Behaviour 70: 13671375. http://dx.doi.org/10.1016/j.anbehav.2005.03.025CrossRefGoogle Scholar
Ungerfeld, R, Hotzel, MJ, Scarsi, A and Quintans, G 2011 Behavioral and physiological changes in early-weaned multiparous and primiparous beef cows. Animal 5: 12701275. http://dx.doi.org/10.1017/S1751731111000334CrossRefGoogle ScholarPubMed
Vergne, AL, Aubin, T, Taylor, P and Mathevon, N 2011 Acoustic signals of baby black caimans. Zoology 114: 313320. http://dx.doi.org/10.1016/j.zool.2011.07.003CrossRefGoogle ScholarPubMed
Vergne, AL, Pritz, MB and Mathevon, N 2009 Acoustic communication in crocodilians: from behaviour to brain. Biological Reviews 84: 391411. http://dx.doi.org/10.1111/j.1469-185X.2009.00079.xCrossRefGoogle Scholar
Waran, N 2001 The social behaviour of horses. In: Keeling, L and Gonyou, HW (eds) Social Behaviour in Farm Animals pp 247274. http://dx.doi.org/10.1079/9780851993973.0247CrossRefGoogle Scholar
Watts, JM, Stookey, JM, Schmutz, SM and Waltz, CS 2001 Variability in vocal and behavioural responses to visual isolation between full-sibling families of beef calves. Applied Animal Behaviour Science 70: 255273. http://dx.doi.org/10.1016/S0168-1591(00)00163-5CrossRefGoogle ScholarPubMed
Weary, DM, Appleby, MC and Fraser, D 1999 Responses of piglets to early separation from the sow. Applied Animal Behaviour Science 63: 289300. http://dx.doi.org/10.1016/S0168-1591(99)00021-0CrossRefGoogle Scholar
Weary, DM and Chua, B 2000 Effects of early separation on the dairy cow and calf 1. Separation at 6 h, 1 day and 4 days after birth. Applied Animal Behaviour Science 69: 177188. http://dx.doi.org/10.1016/S0168-1591(00)00128-3CrossRefGoogle ScholarPubMed
Weary, DM and Fraser, D 1997 Vocal response of piglets to weaning: effect of piglet age. Applied Animal Behaviour Science 54: 153160. http://dx.doi.org/10.1016/S0168-1591(97)00066-XCrossRefGoogle Scholar
Weary, DM, Jasper, J and Hotzel, MJ 2008 Understanding weaning distress. Applied Animal Behaviour Science 110: 2441. http://dx.doi.org/10.1016/j.applanim.2007.03.025CrossRefGoogle Scholar
Weary, DM, Ross, S and Fraser, D 1997 Vocalizations by isolated piglets: a reliable indicator of piglet need directed towards the sow. Applied Animal Behaviour Science 53: 249257. http://dx.doi.org/10.1016/S0168-1591(96)01173-2CrossRefGoogle Scholar
Wells, RS, Irvine, AB and Scott, MD 1987 The social structure of free-ranging bottlenose dolphins. In: Genoways, H (ed) Current Mammalogy pp 247305. Plenum: New York, USACrossRefGoogle Scholar
Wiener, SG, Bayart, F, Faull, KF and Levine, S 1990 Behavioral and physiological responses to maternal separation in squirrel-monkeys (Saimiri sciureus). Behavioral Neuroscience 104: 108115. http://dx.doi.org/10.1037/0735-7044.104.1.108CrossRefGoogle Scholar
Wilkinson, GS 2003 Social and vocal complexity in bats. In: De Waal, FBM and Tyack, PL (eds) Animal Social Complexity: Intelligence, Culture and Individualized Societies. Harvard University Press: Cambridge, MA, USAGoogle Scholar
Wrobel, TA and Dye, AL 2003 Grieving pet death: normative, gender, and attachment issues. Omega Journal of Death and Dying 47: 385393. http://dx.doi.org/10.2190/QYV5-LLJ1-T043-U0F9CrossRefGoogle Scholar
Wynne, CDL 2007 What are animals? Why anthropomorphism is still not a scientific approach to behavior. Comparative Cognitive Behavior Reviews 2: 125135Google Scholar