Table 1 Sample sizes of tagged adult lesser black-backed gulls at each colony before and after landfill closure, following subsampling and removal of incomplete trips. Some individual gulls were tracked in both years of the study (Ribble = 3, Walney = 18); these totals are shown in brackets in the year 2017 row for each site

From: GPS tracking reveals landfill closures induce higher foraging effort and habitat switching in gulls