Mod to start with custom animals?

[Chuckles McMerry]

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[Astasia]

You don't need a mod.

Scenario editor -> add part -> start with animal(s)

This list is dynamically populated and should include all animals in the game, modded or otherwise, including stuff that shouldn't work like dryads.

[The Raven]

keep in mind depending on how many modded animals you have the above reply might take a noticeable amount of time to load and will freeze things up as it does