The only TS4 custom animals I know of are all decor, though I could be missing something. Is this what you are seeking for TS3? I do not believe modding in new actual species would be possible, although I have seen creators make what looks like new creatures out of the exisitng species we do have -...

Has anyone come across adding more animals into TS3? I've noticed TS4 has zoo animals.

Thankyou for your quick response and for the download.

Morning Just a quick question but do you have the download for error trap (running version 1.67)