I’ve just added a way to easily create variants of creatures, which can differ by texture and gameplay parameters. As a result, in addition to brown bull that likes tropics, there is now a black bull that spawns in colder areas:
(actually it’s in the middle of a warm area here but it’s just my testing code :-)). And an extremely rare albino bull that only lives far away from the ocean and gains a lot more meat than normal one when killed:
Now I’m working on something different that a lot of people requested and it should not be too difficult. I’ll post when I have something to show.