Square Pupil.

Did you know that the freshwater shrimp Macrobrachium amazonicum has a square pupil? Well, now you do, courtesy of Alex H. Griman whose photo won 11th place in the 2006 Nikon Small World microscopy photo contest.


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Cool pupil! I've seen squared-off pupils on other animals as well: goats and octopus have rectangular pupils. Octopus pupils remain level with the horizon as the octopus rotates. If you look closely, you'll see that fish eyes have four small lines radiating away from the (circular) pupils at right angles; these reveal that fish eyes swivel to remain level with the horizon as well.
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