Hey btw, another worldbuilding thing: You can, and actually should have weird and impractical cultural things. They’re not inherently unrealistic, for as long as you address the realistic consequences as well.
Let’s say you’ve got a city where there’s tame white doves everywhere. They’re not pests, they’re regarded as sacred, holy protectors of the city, and the whole city cares for them and feeds them like they’re pets. They’re so tame because it’s a social taboo to hurt or scare one. Nice pretty doves :)
Then someone points out that even if they’re not seen as pests, doesn’t having a completely unchecked feral pigeon population - that not only isn’t being culled, but actively fed and cared for - mean that there would be bird shit absolutely all over the place?
A part of you wants to say no, because these are your nice, pretty doves. To explain that there’s a reason why they’re not shitting all over the place, maybe they’re super-intelligent and specifically bred and trained to not shit all over the place. The logistics of how, exactly, could anyone breed and train a flock of feral birds go unaddressed.
An even worse solution would be to not have those birds, editing them out of the world. No, they spark joy, you can’t just toss them out!
Now, consider: Yes, yes they would, but the city also has an extensive public sanitation service that’s occupied 90% of the time by cleaning bird shit off of everything. One of the most common last names in the area actually translates to “one who scrapes off dove shit”, and it’s a highly respected occupation. And thanks to the sheer necessity of constantly regularly cleaning everything, the city enjoys a much higher standard of cleanliness, and less public health issues caused by poor public sanitation.
The doves do protect the city. By shitting fucking everywhere.