english: All vertebrates do, and each time a fish species starts to adapt to this dark, cold, cave environment, over many, many generations, they lose their eyes and their eyesight until the end up like an eyeless cavefish like this one here.
non_english: Vsi vretenčarji jih imajo in vsakič, ko se vrsta ribe začne prilagajati na temno, mrzlo jamsko okolje, čez mnogo, mnogo generacij, izgubijo oči in vid, dokler ne končajo kot tale brezoka riba tule.