I'll no longer be maintaining this mod and instead patching my mods for the Biomes mod, which includes all the functionality of this mod and more https://mods.vintagestory.at/show/mod/8785 For servers and existing users I'll leave this mod up as is.

Bioregions: Pacific Nearctic Realm

This mod prevents animals and plants from spawning, leaving only those native to the Pacific Nearctic. This mod does not add new plants or animals by itself.

You’ll see plants and animals from the Arctic circle, Canadian shield, Western North America, South West North America, and Central America. Plants are based on those present or introduced to the area between 11700 and 700 years ago while animals are those native to those areas during the same span. Mods that add both natural and supernatural creatures will have their non-native and supernatural entities disabled, though server hosts can go into the patches and remove the patch blocking a given animal in order to re-enable it. 

As this mod removes content from the base game, certain technologies and resources may be harder to acquire than normal and some animal or plant based resources may be impossible to acquire without mods adding a native equivalent to the base game animals or plants that were removed.

Mods with content in this Bioregion:

Animals:

Banded Geckos
Cats
Fauna of the Stone Age: Caninae
Fauna of the Stone Age: Capreolinae
Fauna of the Stone Age: Pantherinae
Feverstone Wilds
Lichen
New World Pond Frogs
North American Salamanders
Ornamental Fish
Pacific Newts
Primitive Survival

Plants:

Floral Zones: Caribbean Region
Farm to Table (Manually replace files)
Hide and Fabric (Manually replace files)
Wildcraft (Manually replace files) 
Wildcraft Trees (Manually replace files)

Known Issues
In order for modded plants to work, you need to manually replace their patch files from the “manually replace files” folder in this mod. I’m looking into a way of patching their patches, but for now this will get the same results as the intended final version.

Mods that use the “game” directory for their animals can’t be patched

Links:
https://ko-fi.com/tentharchitect

And a big thanks to everyone who gave feedback and assistance!