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Increase in annual number of observations of geese of all species (mainly barnacle and greylag geese, but including small numbers of white-fronted and Canada geese) flying over or settling at Copenhagen Airport, 2004–2015. The rate of increase is equivalent to a 28% increase per annum (r 2 = 0.72, P = 0.0005) in response to constant effort in monitoring. Data courtesy of Copenhagen Airport
