"These lions are sad, because they are in a zoo."
Translation:Te lwy są smutne, bo są w zoo.
Slightly off topic question (maybe based off of wrongly using 'ci' instead of 'te' here): if people talk about anthropomorphised animals (for example animal characters in a children's cartoon) would they become grammatically personal? Like these real lions in a zoo are "te lwy" but if we're talking about Simba and Mufasa from the movie Król Lew, would it be "Ci lwy"? Not that I'm arguing for it as a right answer, just curious
It would still be "te lwy", because the fact that they're anthropomorphised doesn't change anything about the noun "lwy" itself.
However, the fact that those are two male anthropomorphised lions would result in using "oni" rather than "one" (and forms appropriate for "oni"), so yes, it would have some effect.
What matters is the grammatical gender of the noun you're actually using. E.g. I can call my cat simply "mój kot" and then it needs masculine forms, but if I use my cat's given name (Zuzia, so in English Suzie) and show that it's a female cat, then feminine forms will be used. Or if you're talking about little Tom and little Adam as "chłopcy" (boys), then they're 'masculine personal plural', but if you choose to use "dzieci" (children), then they're 'not masculine-personal plural'.