system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombies]. can cold blooded animals turn into zombies?
gpt
In traditional Haitian Vodou, animals of any sort are not ensoulled and cannot be made into zombies. The particular combination of toxins that produces the highly suggestive zombie-like condition in books like *The Serpent and the Rainbow* doesn't work exactly the same in animals (and even if it did, would require different dosage based on body mass, etc.) In continuities where the condition is caused by a virus, it only works if said virus jumps species, which is easier from mammal to mammal than mammal to reptile or amphibian. 

Supernatural curses don't face the same restriction although, again, lack of possession of a soul might be a barrier to transmission - in *Dungeons & Dragons*, this is a non-issue, all you need is a corpse and a *raise dead* spell; other fantasy games have varying requirements, but it's usually not outside the realm of possibility.