**Acknowledgements**

This study was supported by ELKARTEK (KK-2019/00086), MINECO-Retos (PID2019-111139RB-I00), Grupos UPV/EHU (GIU 2018/150), and Proyectos de InvestigaciónBásica y/o Aplicada (PIBA\_2020\_1\_0026) to EV, Basque Government postdoctoral grant (POS\_2020\_2\_0031) to XP and UPV/EHU postdoctoral grant (ESPDOC20/058) to NR. We would like to thank the organizations AMBAR and CEPESMA for their support in getting the whales' eyes in the best possible conditions.
