The genetic basis of the kākāpō structural color polymorphism suggests balancing selection by an extinct apex predator. - Urban, Lara; Santure, Anna W.; Uddstrom, Lydia; Digby, Andrew; Vercoe, Deidre; Eason, Daryl; Crane, Jodie; Wylie, Matthew J.; Davis, Tāne; LeLec, Marissa F.; Guhlin, Joseph; Poulton, Simon; et al. (PLoS Biology, 2024)