my boss gave me a bag of some birthday gifts (coffee, gift card, etc.) and ….. two bags of cat treats that these freakin idiots LOVE. i’m laughing so hard. i love fellow cat people. don’t worry, i’m gonna share the treats with Silas too, he’s been here for almost 3 weeks he’s officially the fourth member of The Goon Squad™ and thus, family.
So why don’t all vertebrates have this adaptation? It’s an advantage to animals that are active in the dark - cats, dogs, owls, raccoons, crocodiles, and so on - but it makes everything slightly blurry. Many daytime vertebrates (including humans and most other primates) do not have one and instead have better day vision.