Apparently not just physical human bodies can be created wiith AI.
Not clear on what your meaning is here, since human bodies can't be created with AI, but I will take a stab at what I think the intent is. I think the question is: Theoretically, if it were possible to implant AI into humans, would it would seem plausible that it could be implanted into any other living creature.
Well, to my mind, I would say that if one were possible, then sure, why not the others? To be more rational though, I would say that an AI augmented life form would be more likely. Neuralink, as a brain computer interface, is already being experimented with. In addition, robotically controlled arms and legs are able to be moved with signals from the brain, so we are entering into the realm of Android-like beings.
That being said, it is a huge leap from being able to create an interface for the brain to access AI, to "implanting" AI into the body of a living organism as it's own "brain". Even if were possible, would a squirrel with an AI brain still be a squirrel. It brings to mind the thought experiment of the old boat. If you buy an old boat, and slowly replace all the existing boards one by one, when does it stop being the old boat, and now becomes a new boat?