As frogs evolved, they developed a retractor globis muscle behind their eyes. Because there is no bony structure between the eye and the esophagus (food pipe), this muscle can pull the eyes into their ...

Frogs display a remarkable diversity of species as a whole, but does the same hold true for their visual abilities? A new study sought to answer this question by collaborating with researchers in ...

A new study led by a Penn State biologist reveals that frogs have maintained a surprising number of nonvisual light-sensing proteins over evolutionary time. These proteins, called opsins, play a role ...

Frog eyes are distinctive, unique, and fascinating. They are huge, globular, and positioned atop their heads. We know that their eyesight is good, and thanks to their eye placement, frogs have ...