How many birds are there in a city of half a million people?

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Resolving the urban nest predator paradox: The role of alternative foods for nest predators (2011, background): “Populations of urban-positive species that reside in towns and cities can form a significant proportion of the global population of these species (Mason, 2003; Bland et al., 2004; Chamberlain et al., 2009; Fuller et al., 2009).”
Ecological and Psychological Value of Urban Green Space (2010, background): “Sheffield alone supports over 600,000 birds, equating to 1.18 birds per person ( Fuller et al., 2009 ), so urban areas are potentially important arenas for contact between people and wildlife.”