Abstract
On the cover: Fire-bellied toad (Bombina bombina) from southern Poland, where they form a famous hybrid zone with their sister species the yellow-bellied toad (Bombina variegata). Photo credit: Christophe Dufresnes. For more information see “Revisiting a speciation classic: Comparative analyses support sharp but leaky transitions between Bombina toads” by Dufresnes et al. (pp. 548–560; 10.1111/jbi.14018)
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