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Research Cite this article: delBarco-Trillo J. 2018 Shyer and larger bird species show more reduced fear of humans when living in urban environments. Biol. Lett. 14: 20170730. http://dx.Jd-T, 0000-0002-9948-6674 As the natural habitats of many species are degraded or disappear, there is scope for these species to be established in urban habitats. To ease the establishment and maintenance of urban populations of more species we need to better understand what degree of phenotypical change todoi:10.1098/rsbl.2017.0730 pmid:29643219 fatcat:vpkyifnamvdnzmp2iiukdps6qy