[throwaway34241]

There are a lot of levels of "thinking" across the animal / insect / even plant kingdoms. The simplest levels of stimulus response (like a venus fly trap closing its mouth) don't seem to require a metaphysical explanation. But insect behavior is more complex and mammal and human behavior even more so.

At which level do the existing rules of the material world start to seem less plausible to you than a second unseen world with different rules, that interacts with this one under specific circumstances (if that's what you mean by dualism)?

As we can presently see with computers and machine learning, pretty complex behavior is possible through systems that operate via known physical processes.