you can do anything to ur creature physically without taking out its spine so 1)there can be slugs 2)you can have to my knowledge "organs" on the creature but it will prob not work in the game, just like how some peopel are worried that online there will be giant dicks walkin around you could shape something like that on ur creature. 3) Everything is customizable including plants, 4) There are more differences between sexes in animals than similarities particularly in the more complex ones such as birds and insects.

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You won't remember me anyway, so I won't help you with a witty saying.