Many grazing mammals have horizontal bar shaped pupils giving them a very eerie look. What is the benefit of horizontal slit pupils like this?

Answer A wider field of view without sun bleaching occurring.

The wide slit allows the grazer to take in more light from different angles giving it a wide field of view. The fact that it is horizontal minimizes how much of the light comes from above decreasing the likelihood of sun bleaching.

Asked by · Last updated 3 months ago · 10K views