Data from: Why do zoos attract crows? A comparative study from Europe and Asia

László Kövér, Szabolcs Lengyel, Makiko Takenaka, Alice Kirchmeir, Florian Uhl, Rachel Miller & Christine Schwab
Crows have successfully colonized many cities and urban zoos have been important in this process. To evaluate why zoos attract crows, we quantified crow numbers and behaviour in three zoos in Europe (Debrecen, Edinburgh, Vienna) and one in Asia (Sapporo). Data were collected in 445 surveys over 297 days in summer 2014 and winter 2014-15. We found that crow numbers were highest in Vienna, intermediate in Debrecen and Edinburgh and lowest in Sapporo, increased significantly...
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