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Similar to what happens in our eyes, shark pupils dilate in the dark to allow more light to enter the eye and therefore improve night vision. While the eye of a grey reef shark (like the one in this picture) looks like a cat eye during the day, you can see in this picture that the pupil is dilated and almost round. These sharks hunt mainly at night, using a whole array of superior senses to detect and track their prey. Go compare the eyes to my last post to see the difference a few hours can make!

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© Hannes Klostermann | HK-UNDERWATER.COM 2018
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French Polynesia
Similar to what happens in our eyes, shark pupils dilate in the dark to allow more light to enter the eye and therefore improve night vision. While the eye of a grey reef shark (like the one in this picture) looks like a cat eye during the day, you can see in this picture that the pupil is dilated and almost round. These sharks hunt mainly at night, using a whole array of superior senses to detect and track their prey. Go compare the eyes to my last post to see the difference a few hours can make!