Global insect decline: Comments on Sánchez-Bayo and Wyckhuys (2019)

The recently published review by Sánchez-Bayo and Wyckhuys (2019) in Biological Conservation provides a needed review of global insect decline. There is much in the study to recommend it: this is the first attempt to review the magnitude, geographic nature, and taxonomic scope of the insect decline phenomenon. Their focus on traits that are correlated with declines, their conclusion that specialists are losing ground to ecological generalists, and their systematic quantifications of declines are valuable contributions.