

Linux is only a kernel. It isn’t a full operating system; it’s only a small (albeit central) part of one. Everything else is components like the GNU utils, X and/or Wayland, so goes on. That’s why some people call Debian, Fedora, Arch etc. “GNU/Linux distributions”, to highlight that those components are damn important.
Android uses the Linux kernel (or a modification of), but it lacks practically every single other thing you’d see in a common GNU/Linux distribution. And applications are incompatible - you can’t run Android applications in, say, Debian, nor vice versa.
And, more importantly, Android lacks what makes GNU/Linux worth using: commitment to free and open source software (FOSS).
Sure, you can fork Android. Some already did it; it’s called GrapheneOS. But when people say they want a “Linux phone”, they mean they want a phone version of a GNU/Linux distribution, because of that commitment to FOSS. You don’t get it from Android.
Their pupils are vertical slits so they can let more or less light in, depending on the surrounding light. Note how they pupils dilate by a lot when in the dark, but if your cat is lazying under the Sun the slit gets really narrow.