Bird data : UK, Sheffield
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Urban environments are often characterized as supporting a few abundant, generalist species best adapted to living alongside humans, and as such, cities are seen as agents of biotic homogenization. However, there are surprisingly few descriptions of biological populations found in cities. Here, we provide the first complete citywide population estimates of birds for any UK city, and examine the conservation status of the assemblage in comparison with the country's avifauna at large.
Fuller RA, Tratalos J, Gaston KJ. 2009. How many birds are there in a city of half a million people? Divers. Distrib. 15, 328-337.