W-shaped pupils likely also help cuttlefish see color and polarization of light, despite not having any cone cells in their retinas!

https://blogs.scientificamerican.com/octopus-chronicles/polarized-display-sheds-light-on-octopus-and-cuttlefish-vision-and-camouflage/

https://www.science.org/content/article/how-colorblind-cuttlefish-may-see-living-color

Chinchillas have vertical slit pupils despite being small herbivorous rodents. There are definitely quite a few exceptions.

TIL Jabba the Hutt is a small ambush predator

Some of that is controversial as far as I know. And the pseudopupils are an optical Artifact since every single eye has its own opening.

I loved this graphic. Great content, something I’d never wondered about and just today realized I’m not curious enough.

Thanks op or bot whichever.