{"references": [". Nisiforou, and A. G. Charalambides, \"Assessing undergraduate university students' level of knowledge, attitudes and behaviour towards biodiversity: A case study in Cyprus\", International Journal of Science Education, vol. 34, pp.1027\u20131051, March 2012.", "S. Anu, \"Test for Measuring the Knowledge in Biodiversity of Secondary School Students\", International Journal of Innovative Research and Development, vol. 3, 66-74, July 2014.", "H. J. Huang, and Y. T Lin. \"Undergraduate Students. Attitudes toward Biodiversity\", Universal Journal of Educational Research, vol. 2, 379-386, April 2014.", "B. L Bruyere, \"The Effect of Environmental Education on the Ecological Literacy of First-Year College Students\", Journal of Natural Resources and Life Sciences Education, vol. 37, pp. 20-26, 2008.", "United Nations, Convention on Biological Diversity, Rio de Janeiro, 1992.", "R. Jiwa, and N. Esa, \"Student Teachers' Knowledge of Biodiversity\", International Journal of Scientific and Research Publications, vol.5, pp.1-4, March 2015.", "G. Espinoza. Gesti\u00f3n y Fundamentos de Evaluaci\u00f3n de Impacto Ambiental. Santiago , Chile. Banco Interamericano de Desarrollo (BID) y Centro de Estudios para el Desarrollo (CED), 2007.", "A. Balmford, L. Clegg, T. Coulson, and J. Taylor, \"Why conservationists should heed pokemon\", Science, vol. 295 p.2367, March 2002.", "I. Palmberg,\" Student teachers' knowledge of and interest in species\", Nordic Studies in Science Education, 8, 244\u2013257, December 2012.\n[10]\tJ. H. Wandersee, and E. E Schussler, \"Toward a theory of plant blindness\". Plant Science Bulletin, vol. 47, pp 2\u20139, 2001.\n[11]\tP. Lindemann-Matthies, and E. Bose, \"How many species are there? Public understanding and awareness of biodiversity in Switzerland\", Human Ecolology, vol. 36, pp.731\u2013742, October 2008.\n[12]\tM. Dikmenli, \"Biology student teachers' conceptual frameworks regarding biodiversity\", Education, vol. 130, pp. 479\u2013489, Spring 2010.\n[13]\tM. Huxham, A. Welsh, A. Berry, and S. Templeton, \"Factors influencing primary school children's knowledge of wildlife\", Journal of Biological Education, vol.41, pp.9\u201312, Winter 2006.\n[14]\tA. Bebbington, \"The ability of A-level students to name plants\". Journal of Biological Education, vol.32, pp.62\u201367, 2005.\n[15]\tO. Magntorn, and G. Hellde'n,\"Reading nature from a 'bottom-up' perspective\". Journal of Biological Education, vol. 41(2), pp. 68\u201375, Spring 2007.\n[16]\tS. Tunnicliffe, and M. Reiss, \"Building a model of the environment: how do children see animals. Journal of Biological Education, vol.33, pp.142\u2013148, 1999.\n[17]\tF. Bogner, \"Empirical evaluation of an educational conservation programme introduced in Swiss secondary schools\". International Journal of Science Education, vol. 21, pp.1169\u20131185, 1999.\n[18]\tP. Lindemann-Matthies, and M. Hyseni, \"Perception and knowledge of environmental issues, in particular biodiversity by stakeholders and laypersons in Kosovo\u2014A case study\". Journal of International Environmental Application and Science, vol. 4, pp. 413\u2013427, January 2009.\n[19]\t X. Yu, \"Is environment 'a city thing' in China? Rural\u2013urban differences in environmental attitudes\". Journal of Environmental Psychology, vol. 38, pp. 39\u201348., June 2014\n[20]\tD. Dash, B. Mishra, and M.K.Satapathy, \"Education for sustainable development\", Indian Educational Review, 47, 7\u201329, July 2010.\n[21]\t S. Chandrasekar, C.Sundaravadivelan, A. and A.Selvan, \"Awareness on biodiversity among higher secondary students in Vilathikulam area\", International Journal of Physical and Social Sciences, 2(9), 305\u2013313. 31, September 2012. \n[22]\t Basque Government, Curriculum for Basic Education at the Basque Autonomic Region (Decree 236/2015 December 22), Vitoria, Basque Government, 2007.\n[23]\tCounty Council of Biscay, Bizkaia y sus Montes, Bilbao, Diputaci\u00f3n Foral de Bizkaia, 2017.\n[24]\t Instituto Nacional de Estad\u00edstica, Contabilidad regional de Espa\u00f1a., Gobierno de Espa\u00f1a, 2016.\n[25]\tI. Bengoetxea, Culture as the Engine of Bilbao\u00b4s economic and social transformation. International Award UCLG, Mexico, 2014.\n[26]\t S. Evans, C. Garside, S. Gebbels, J. Stockill. and M. Green, \"The 'citizens' day: encouraging young people to acquire, value and use environmental knowledge\". School Science Review, vol.88, pp.45\u201350, June 2007.\n[27]\tL. Barraza,\" Children's Drawings About the Environment\". Environmental Education Research, vol.5, pp. 49\u201366, 1999.\n[28]\tM. Gadgil, The Biophilia Hypothesis, S. R. Kellert, E. O. Wilson, Eds., Island Press, Washington, DC, 1999.\n[29]\tR. Louv, Last child in the woods: Saving our children from Nature-Deficit Disorder. Chapel Hill, NC: Algonquin., 2005.\n[30]\t J. Loidi, I. Biurrun, I. Garc\u00eda-Mijangos, J.A. Campos, and M. Herrera, La vegetaci\u00f3n de la Comunidad Aut\u00f3noma del Pa\u00eds Vasco. Eusko Jaurlaritza \u2013 Gobierno Vasco, 2011.\n[31]\tP. Patrick, and S.D. Tunnicliffe, \"What Plants and Animals Do Early Childhood and Primary Students' Name? Where Do They See Them?\", Journal of Science, Education and Technology, vol. 20, pp. 630\u201364, October 2011.\n[32]\t S.D. Tunnicliffe, S. Gatt, C. Agius, and S. A. Pizzuto, \"Animals in the lives of young Maltese Children\", Eurasia Journal of Mathematics, Science and Technology Education, vol. 4, pp. 215-221, October 2008.\n[33]\tP. Prokop, and S. Tunnicliffe, \"''Disgusting'' animals: primary school children's attitudes and myths of bats and spiders\". Eurasia Journal of Mathematics, Science and Technology Education, vol. 4, pp. 87-97, April 2008. \n[34]\tR. D. Dunn, \"Modern Insect Extinctions, the Neglected Majority\", Conservation Biology, vol. 19, pp. 1030-1037, June 2005.\n[35]\tD. Grimaldi and M.S. Engel. Evolution of the Insects., Cambridge, New York, Melbourne,-Cambridge University Press, 2005.\n[36]\tE. J. Fittkau and H. Klinge, \"On Biomass and Trophic Structure of the Central Amazonian Rain Forest Ecosystem\", Biotropica, vol. 5, pp. 2-14, April, 1973.\n[37]\t L. Schneekloth, \"Where did you go? ''The forest''. ''What did you see?'' Nothing\". Children's Environments Quarterly, vol. 6,pp. 14\u201317, 1989.\n[38]\t T. Fujiwara, \"Plant nutrition--roots of life for fundamental biology and better crop production\", Plant & Cell Physiology, vol. 50, pp. 2-4, January 2009.\n[39]\tD. Sanders, \"Making public the private life of plants: the contribution of informal learning environments\", International Journal of Science Education, vol. 29, pp. 1209\u20131228, August 2007.\n[40]\tC. Barman, M. Stein, S. McNair, and N. Barman, \"Students' ideas about plants and plant growth\", The American Biology Teacher, vol. 68, pp. 73\u201379, February 2006.\n[41]\t S. D. Tunnicliffe, C. Ueckert,\" Early biology: the critical years for learning\", Journal of Biological Education, vol. 45, pp. 173-175, December 2011.\n[42]\tFood and Agriculture Organization. \"The future of Food and Agriculture: Trends and and challenges\", Food and Agriculture Organization of the United Nations, Rome, 2017.\n[43]\tG. MacKerron, and S. Mourato. \"Happiness is greater in natural environments\", Global Environmental Change, vol. 23, pp.992-1000., October 2013.\n[44]\tO. R. W Pergams, and P.A. Zaradic. \"Evidence for a fundamental and pervasive shift away from nature-based recreation\", Proceedings of the National Academy of Sciences, vol.105, pp. 2295-2300, 2008."]}

Biodiversity provides humans with a great range of ecosystemic services; it is therefore an indispensable resource and a legacy to coming generations. However, in the last decades, the increasing exploitation of the Planet has caused a great loss of biodiversity and its acquaintance has decreased remarkably; especially in urbanized areas, due to the decreasing attachment of humans to nature. Yet, the Primary Education curriculum primes the identification of flora and fauna to guarantee the knowledge of children on their surroundings, so that they care for the environment as well as for themselves. In order to produce effective didactic material that meets the needs of both teachers and pupils, it is fundamental to diagnose the current situation. In the present work, the knowledge on biodiversity of 3rd cycle Primary Education students in Biscay (n=98) and its relation to the size of the town/city of their school is discussed. Two tests have been used with such aim: one for tree identification and the other one so that the students enumerated the species of trees and animals they knew. Results reveal that knowledge of students on tree identification is scarce regardless the size of the city/town and of their school. On the other hand, animal species are better known than tree species.