Adding onto this question will rabbits and bunny be added? I like the small fluffy animals.
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Unfortunately (if i remember from an old comment) it seems like RahiMew does not plan to add more species to the game. However, mods can add bird and rabbit species.
Just in case you don't know how, you can enable molded launcher from the settings menu, after which you will have to refresh the page or re-open the game.