The attribution of the source data for the cricket and wren examples is wrongly cited in the captions of Figs 3 and 4, and the source references are not listed.
Fig. 3 (caption). Citation [17] (3 times) should refer to: Moran PA, Hunt J, Mitchell C, Ritchie MG, Bailey NW. Sexual selection and population divergence III: Interspecific and intraspecific variation in mating signals. J Evol Biol. 2020;33: 990–1005. doi:10.1111/jeb.13631
Fig. 4 (caption). Citation [18] (3 times) should refer to: Halfwerk W, Dingle C, Brinkhuizen DM, Poelstra JW, Komdeur J, Slabbekoorn H. Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression. J Evol Biol. 2016;29: 1356–1367. doi:10.1111/jeb.12876
All other citations are correct.
I apologize for these errors and omissions.
Hal Whitehead