any mod creature should work so long as you have the blueprint path for the animal you want to use. If you've followed the example ini in discussions and its not working, please post what you have for your rpcooking section in your GUS.INI and maybe we can see whats wrong.

We were using Marni's Wildlife Mod on our Fjordur server and it worked just fine with the cows. We are currently playing on Lost Island and don't have that mod, but the female megaloseros work to give milk. I have one and I am getting lots of milk.

got it working with the mod we are using, thank you!