“…Since 2006, research on wild bees in cities shows that diverse populations of bees live in urban landscapes. In the midst of a pollination crisis, where insect pollinator populations are experiencing significant declines (Jaffe et al 2010;Pleasants & Oberhauser 2013;Goulson et al 2015), studies of native bee richness and abundance indicate that diverse communities of wild bees persist in cities in many parts of the world such as Berlin, Germany (Saure et al 1998); Birmingham, Bristol, Cardiff, Dundee, Edinburg, Glasgow, Hull, Leeds, Leicester, London, Northampton, Reading, Sheffield, Southampton, and Swindon in the United Kingdom Baldock et al 2015;Sirohi et al 2015); Melbourne, Australia (Threlfall et al 2015); Guanacaste Province, Costa Rica (Frankie et al 2013); Vancouver, Canada (Tommasi et al 2004); and Berkeley (Frankie et al 2005;2016), Chicago (Tonietto et al 2011;Lowenstein et al 2014), New York City (Matteson et al 2008;Matteson & Langellotto 2009), Phoenix (Cane et al 2006), San Francisco (McFrederick & LeBuhn 2006), and St. Louis in the United States. Bees in these cities include both solitary and eusocial species, especially species that are cavity nesters and pollen generalists Cariveau & Winfree 2015;Sirohi et al 2015) and specialized species indicative of high-quality habitat (e.g., pollen specialists and their cleptoparasites) (Tonietto et al 2011;Sheffield et al 2013).…”