The Lesser Black-backed Gull Larus fuscus breeds in increasing numbers on rooftops in urban areas in western Europe. In The Hague, the Netherlands, the number of rooftop nests more than doubled between 2010 and 2017 (Lensink et al. 2015; Buijs & Huig 2019). Most nests are situated on flat-roofed buildings that provide little or no shelter. Here we report on a crèche at a b
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