Requirments: Notepad (Comes with computer)
This is a tutorial for changing an animal's biome.
For this ou need the main XML file which is caed in the entities\units\animals\ai.
It's th folder that says Animal Name. XML
click on he fil and go to Open With... and click on Notepad.
Scroll down the document nti you find a list of animal biomes.
On the right it should say sensitivitie="10", 10 can be any number, making the number higher makes the animal enjoy this biome more and the numbers can go to -2, -3 and so on. When you're finished go to the top bar and press File and Save as and hen save it and then your animal has a new biome.

Happy coding!