Thanks for the links @simgirl1010 ! I read about the llamas, embracing the cows later today :)
I get the feeling I'm pretty much alone bringing RL facts into my game like this. I realize farm animals see no borders if kept indoor like in larger farm establishments, but I thought some animal species would have climate preferences etc. Learned that some chicken think it's fine with little space to move, while others would easily fly over a fence, that some are better for eggs than meat, and that some go better with human (sim) kids than others. Maybe a cow is more a cow, after all we have only 2 color versions. In my game I want to find that either the white or the beige (added: llama) is better in cold/hot areas, as if the wool gets too hot (actually some chickens have preferences like this). Darker colors normally absorb more sun warmth (re exterior wall paint :) ), so I might go with white llamas being a better choice in hot worlds like Oasis Springs and Sulani.
Well, I'll just keep making my game more complicated than needed, LOL.