Why sheep, goats, octopuses and toads have rectangular pupils

March 23, 2012 · 2 comments

While most animals, including humans, have round pupils, the pupils of sheep, goats, octopuses and toads are of rectangular shape.

Why sheep, goats, octopuses and toads have rectangular pupils

The reason these animals have rectangular pupils is because this is what helps them avoid predators. Rectangular pupils tend to get very narrow during day time, which gives animals a greater accuracy of depth perception in their peripheral vision. Traditionally seen as prey, thanks to their eyes these animals are able to avoid predators.

Why sheep, goats, octopuses and toads have rectangular eyes

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Name March 25, 2012 at 6:21 pm

This is scary because the simple law can be seen in all types of animals: For example Snakes, who predate, have vertical eyes like cats as well.
After researching a bit, it seems that narrow pupils will sharpen the sight — cats have a narrow horizontal slot, which would give them high accuracy in horizontal sight.

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