– What does “non overlapping” Field of View mean?

Question

I read in an article that birds bob their heads while walking because they eyes do not have an overlapping FOV.

I have no idea what that means.

In: Biology

Answer 1

Each eye as a field of vision (FOV). Where they overlap, you can have depth perception or a form of 3D vision. 

Prey species tend to have eyes to the side, to maximize the total area of the combined fields of view, for maximum awareness of their surroundings. 

Predator species often have front facing eyes with overlapping fields of vision, giving them better depth perception and tracking on what’s in front of them.