Observations on cooperative fishing, use of bait for hunting, propensity for marigold flowers and sentient behaviour in Mugger Crocodiles Crocodylus palustris (Lesson, 1831) of river Savitri at Mahad, Maharashtra, India
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Abstract
As far as animal cognition is concerned, in comparison with mammals and birds, reptiles have been underestimated and research in reptilian cognition hasn’t progressed much due to this bias. Though crocodiles are generally stereotyped as lethargic and lacking social interactions except for territoriality, parental care and prey ambush, they demonstrate discrete behavioural repertoire in a variety of situations suggestive of refined cognition. The observations presented here were recorded during a long-term study on Muggers Crocodylus palustris of Savitri River in Maharashtra, and indicate social behaviour of remarkable acuity among Muggers to optimize foraging, which clearly hints at cooperative fishing. Also, on many occasions here, the Muggers were seen to have sticks on their snouts or lay still in the vicinity of floating twigs presumably to lure birds that desperately scouted for nesting material; though only on one occasion the unsuspecting bird was ambushed successfully. Flight initiation distances (FID) of birds that forage and nest in crocodilian habitat have been measured to assess their wariness towards crocodile’s presence. We report the attraction of free ranging Muggers here to the yellow Marigold Tagetes erecta flowers. We also remark on apparent sentience involving a dog that was chased into the river by a pack of feral dogs, the ‘aquatic refugee’ having been seemingly nudged and escorted to safety of the bank by crocodiles. All these behaviours are discussed in the light of previous reports involving other crocodilian species elsewhere, to assess the cognitive faculty of this species.
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References
Alexander, R.D. (1974). The evolution of social behaviour. Annual Review of Ecology, Evolution, and Systematics 5: 325–383.
Battye, R.K.M. (1945). A Crocodile’s Misadventure. Journal of the Bombay Natural History Society 45: 427–428.
Blumstein, D.T. (2003). Flight-initiation distance in birds is dependent on walker starting distance. Journal of Wildlife Management 67: 853–857.
Blumstein, D.T. (2006). Developing an evolutionary ecology of fear: how life history and natural history traits affect disturbance tolerance in birds. Animal Behaviour 71(2): 389–399. https://doi.org/10.1016/j.anbehav.2005.05.010
Boissy, A. (1995). Fear and fearfulness in animals. Quarterly Review of Biology 70: 165–191.
Bonnet, X., R. Shine & O. Lourdais (2002). Taxonomic chauvinism. Trends of Ecology & Evolution 17: 1–3.
Bötsch, Y., S. Gugelmann, Z. Tablado & L. Jenni (2018). Effect of human recreation on bird anti-predatory response. PeerJ 6: e5093. https://doi.org/10.7717/peerj.5093
Brattstrom, B.H. (1974). The Evolution of Reptilian Social Behavior. American Zoologist 14(1): 35–49. https://doi.org/10.1093/icb/14.1.35
Burghardt, G.M. (2005). The Genesis of Animal Play: Testing the Limits. The MIT Press, London, 520 pp.
Burghardt, G.M. (2013). Environmental enrichment and cognitive complexity in reptiles and amphibians: concepts, review, and implications for captive populations. Applied Animal Behaviour Science 147: 286–298.
Chavan, U.M. & M.R. Borkar (2022a). Population trends of Mugger Crocodile and human-crocodile interactions along the Savitri River at Mahad, Maharashtra, India. Journal of Threatened Taxa 14(11): 22118–22132. https://doi.org/10.11609/jott.7934.14.11.22118-22132
Chavan, U.M. & M.R. Borkar (2022b). Basking Behaviour and Use of Riparian Tunnels by Mugger Crocodiles Crocodylus palustris (Lesson, 1831) of Savitri River at Mahad, Maharashtra, India. International Journal of Zoological Investigations 8(2): 921–937. https://doi.org/10.33745/ijzi.2022.v08i02.109
Clark, R.W., W.S. Brown, R. Stechert & H.W. Greene (2012). Cryptic sociality in rattlesnakes (Crotalus horridus) detected by kinship analysis. Biology Letter 8: 523—525.
Da Silva, A. & J. Lenin (2010). Mugger crocodile Crocodylus palustris, pp. 94–98. In: Manolis, S.C. & C. Stevenson (eds.). Crocodiles, Status Survey and Conservation Action Plan, 3rd Edition. Crocodile Specialist Group, Darwin.
De Meester, G. & S. Baeckens (2021). Reinstating reptiles: from clueless creatures to esteemed models of cognitive biology. Behaviour 158: 1057–1076.
De Silva, M.C., A.A.T. Amarasinghe, A. De Silva & D.M.S.S. Karunarathna (2011). Mugger Crocodile (Crocodylus palustris Lesson, 1831) Preys on a Radiated Tortoise in Sri Lanka. Taprobanica 3(1): 38–41.
De Silva, A., J.M. Probst, P.D.D.S. De Silva & S. Karunarathna (2018). An incident of a Mugger Crocodile (Crocodylus palustris) devouring a pangolin (Manus crassicaudata). WildLanka 6(3): 147–150.
De Vere, A.J. & S.A. Kuczaj (2016). Where are we in the study of animal emotions? Wiley Interdisciplinary Reviews: Cognitive Science 7(5): 354–362.
Dinets, V. (2010). Nocturnal behaviour of the American Alligator (Alligator mississippiensis) in the wild during the mating season. Herpetological Bulletin 111: 4–11.
Dinets, V. (2011). Effects of aquatic habitat continuity on signal composition in crocodilians. Animal Behaviour 82: 191–201.
Dinets, V. (2014). Apparent coordination and collaboration in cooperatively hunting crocodilians. Ethology, Ecology & Evolution. https://doi.org/10.1080/03949370.2014.915432
Dinets, V. (2015). Play behaviour in crocodilians. Animal Behavior and Cognition 2(1): 49–55. https://doi.org/10.12966/abc.02.04.2015
Dinets, V. (2017). Coordinated hunting by Cuban Boas. Animal Behavior and Cognition 4(1): 24–29. https://doi.org/10.12966/abc.02.02.2017
Dinets, V., J.C. Brueggen & J.D. Brueggen (2013). Crocodilians use tools for hunting. Ethology, Ecology & Evolution 27(1): 74–78. https://doi.org/10.1080/03949370.2013
Doody, J.S. (2011). Environmentally-cued hatching in reptiles. Integrative and Comparative Biology 51: 49–61.
Doody, S.J., G.M. Burghardt & V. Dinets (2013). Breaking the social–non-social dichotomy: a role for reptiles in vertebrate social behavior research? Ethology – International Journal of Behavioural Biology 119(2): 95–103. https://doi.org/10.1111/eth.12047
Doody, J.S., V. Dinets & G.M. Burghardt (2021). The Secret Social Lives of Reptiles. Johns Hopkins University Press, 400 pp.
Dowling, L. & F. Bonier (2018). Should I stay, or should I go: Modeling optimal flight initiation distance in nesting birds. PLoS ONE 13(11): e0208210. https://doi.org/10.1371/journal.pone.0208210
Duncan, I.J. (2006). The changing concept of animal sentience. Applied Animal Behaviour Science 100(1–2): 11–19.
Gaston, K.J. & R.M. May (1992). Taxonomy of taxonomists. Nature 356: 281–282.
Gazda, S.K., R.C. Connor, R.K. Edgar & F. Cox (2005). A division of labour with role specialisation in group hunting bottlenose dolphins (Tursiops truncatus) off Cedar Key, Florida. Proceedings of the Royal Society B: Biological Sciences 272: 135–140.
Gray, M.А., S.L. Вaldauf, P.J. Mayhew & J.K. Hill (2006). The response of avian feeding guilds to tropical forest disturbance. Conservation Biology 21: 133–141
Grendeus, S. & S.A. Reber (2020). Crocodylia Cognition, pp. 1–9. In. Vonk, J. & T. Shackelford (eds.). Encyclopedia of Animal Cognition and Behavior. Springer, Cham, 7539 pp. https://doi.org/10.1007/978-3-319-47829-6_926-1
Jerison, H.J. (1973). Evolution of the Brain and Intelligence. Academic Press, New York, 496 pp.
Kellert, S.R. (1993). The biological basis for human values of nature, pp. 42–69. In: Kellert, S.R. & E.O. Wilson (eds). The Biophilia Hypothesis Island Press, Washington, D.C., 484 pp.
King, F.W., J. Thorbjarnarson & C. Yamashita (1998). Cooperative feeding, a misinterpreted and under-reported behavior of crocodilians. Florida Museum of Natural History, p. 9. http://www.flmnh.ufl.edu/herpetology/herpbiology/bartram.htm. Accessed on 12 April 2014.
Kpe´ra, G.N., N. Aarts, R.C. Tossou, G.A. Mensah, A. Saı¨dou, D. Kossou, A. B. Sinsin & A. J.van der Zijpp (2014). ‘A pond with crocodiles never dries up’: a frame analysis of human–crocodile relationships in agro-pastoral dams in Northern Benin. International Journal of Agricultural Sustainability 12(3): 1–18. http://doi.org/10.1080/14735903.2014.909637
Latifian, E., C. Otur, B. Abanoz-Secgin, S.F. Arslanoglu & A. Kurt-Kizildogan (2021). Evaluation of antimicrobial activity in extracts of different parts of three Tagetes sp. Turkish Journal of Field Crops 26(1): 117–122. https://doi.org/10.17557/tjfc.950272
MacLean, P. (1990). The Triune Brain in Evolution. Plenum, New York, xxiv+672 pp.
Mikloukho-Maklay, N.N. (1892). Puteshestviyana Bereg Maklaya [Travels to Maklay Coast]. Russian Academy of Sciences, Saint-Petersburg, 316 pp.
Mobaraki, A. (2015). Sustainable Management and conservation of the Mugger Crocodile (Crocodylus palustris) in Iran. Master’s degree in Management and Conservation of the Species in Trade: The International Framework 11th edition. International University of Andalusia Baeza, Spain.
Nagloo, N., S.P. Collin, J.M. Hemmi & N.S. Hart (2016). Spatial resolving power and spectral sensitivity of the salt water crocodile, Crocodylus porosus and fresh water crocodile Crocodylus iohnstoni. Journal of Experimental Biology 219(9): 1394–1404.
Padalia, H. & S. Chanda (2015). Antimicrobial efficacy of different solvent extract of Tagetes erecta L. flower, alone and in combination with antibiotics. Applied Microbiology, Open Access 1(1): 1–10. https://doi.org/10.4172/2471-9315.1000106
Panksepp, J. & J.B. Panksepp (2013). Toward a cross-species understanding of empathy. Trends in Neurosciences 36(8): 489–496. https://doi.org/10.1016/j.tins.2013.04.009
Pawar, S. (2003). Taxonomic chauvinism and the methodological challenged. Bioscience 53: 861–864.
Proctor, H.S., G. Carder & A.R. Cornish (2013). Searching for animal sentience: a systematic review of the scientific literature. Animals 3(3): 882–906.
Robin, E.D. (1973). The evolutionary advantages of being stupid. Perspectives in Biology and Medicine 16: 369–380.
Shumaker, R.W., K.R. Walkup & B.B. Beck (2011). Animal Tool Behavior: The Use and Manufacture of Tools by Animals. The Johns Hopkins University Press, Baltimore, xvii + 282 pp.
Somaweera, R., M.L. Brien, S.G. Platt, C. Manolis & B.L. Webber (2018). Direct and indirect interactions with vegetation shape crocodilian ecology at multiple scales. Fresh Water Biology 64(2): 257–268. https://doi.org/10.1111/fwb.13221
Tinbergen, N. (1953). Social Behaviour in Animals: With Special Reference to Vertebrates. Methuen, London, xi + 150 pp.
Venugopal, P.D. (2006). Observations on Mugger Crocodylus palustris Lesson feeding on birds in Ranganthittu Bird Sanctuary, Karnataka, India. Journal of the Bombay Natural History Society 103(1): 105.
Vijaykumar, V.B., C. Choudhury & V.C. Soni (1995). Dietary habits of Mugger (Crocodylus palustris) in Andhra Pradesh, South India. Hamadryad 20: 8–12.
Whitaker, R. & Z. Whitaker (1984). Reproductive biology of the mugger (Crocodylus palustris). Journal of the Bombay Natural History Society 81(2): 297–317.
Whitaker, R. & Z. Whitaker (1989). Ecology of Mugger, pp. 276–296. In: Crocodiles: Their Ecology, Management and Conservation. IUCN, Gland, 308 pp.
Wilkinson, A. & L. Huber (2012). Cold-blooded cognition: reptilian cognitive abilities, pp. 129–143. In: Vonk, J. & T.K. Shackelford (eds). The Oxford Handbook of Comparative Evolutionary Psychology Oxford University Press, Oxford, 600 pp.
Wilkinson, A., K. Kuenstner, J. Mueller & L. Huber (2010). Social learning in a non-social reptile (Geochelone carbonaria). Biology Letters 6: 614–616.