Cohabiting ball pythons causes stress, because, as mentioned above, it forces them to compete for resources and they can't properly get away from each other as they would in the wild. If there is one hide or water dish location they both prefer, the stronger one will monopolize it and they may even fight over it. Here is a video showing why you should not cohab ball pythons and what can happen if you do: https://www.youtube.com/watch?v=Gx_Osbu-hvM
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