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In the animal kingdom there is a striking variety of pupil shapes, with great variety among relatively close relatives. Cats have vertical slits. Siberian tigers have round pupils. Cuttlefish have a W shape. Goats have what I would call a horizontal bar. Many foxes have vertical slits, many dogs have round ones.

I just started paying attention to it and I was looking at some good pictures of both Japanese and European squirrels. I sometimes feel that I see a round irregularity at the centre, but can never be sure.

Japanese squirrel Red squirrel? Red squirrel

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Here's a good photo of a squirrel eye showing the pupil being round.

enter image description here

Source: https://www.treklens.com/gallery/photo390926.htm

Also, these acrylic squirrel eyes for taxidermy show a round pupil.

enter image description here

Source: https://www.mckenziesp.com/Squirrel-Eyes-Acrylic-C3837.aspx

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