How Fish Adapt to Seeing on Land?

"Salmon migrating from the open ocean to inland waters do more than swim upstream. To navigate the murkier freshwater streams and reach a spot to spawn, the fish have evolved a means to enhance their ability to see infrared light. Humans lack this evolutionary adaptation," writes Medical News Today. "For nearly a century, scientists have puzzled over how salmon as well as other freshwater fish and amphibians, including frogs, easily shift their vision from marine or terrestrial environments...Now, scientists at Washington University School of Medicine in St. Louis report in the journal Current Biology that they have solved the mystery." Read more.