Fig. 3
From: True cicadas (Cicadidae) as prey for the birds of the Western Palearctic: a review
Number of bird species studied by different diet methods (neck collars, stomach analysis, pellets and regurgitations, droppings, observation and photography, and nest remains) found in the Cramp’s Birds of the Western Palearctic on CD-Rom (CBWP; studies mostly 1920–1989) and in other sources (Other; mostly 1990–2019). A species contributes to more than one category if it has been studied by different methods