From Wondrous Walk:

Explore the incredible diversity of animal pupils and discover how their unique shapes reflect each animal’s role in its ecosystem.
When you look into the eyes of various animals, you’ll notice some extraordinarily shaped pupils. For example, house cats are twilight hunters with vertically elongated pupils. Many grazing animals, like goats, have rectangular pupils. Cuttlefish has W-shaped pupils. But did you know that lions don’t have slit-shaped pupils like house cats do? So, what’s going on? Why are there so many different pupil shapes? Let’s dive into the science of animal vision to find out why and uncover the reasons behind these fascinating adaptations.

[Via Neatorama]