If you sit down next to a cat, and throw your arm over the back of the sofa while someone reaches over from behind and starts to pet the cat, and then after a little bit you stand up and leave while the phantom arm is still petting the cat, the cat understands that something really freaky is happening, gets scared, and runs away.
I would have thought they’d be happy that whatever weird thing is happening is petting them, but apparently not. An arm with no human is alarming and bad. I think it’s cool that their mental model is that similar to ours.
I remember an article not long ago about a songbird that “riffs” within its song. Something like a jazz musician might. I’m fuzzy on the details, but this was stated as a sign of intelligence. The theory is that neural density might be variable based on the species…or something. Basically even that a bird brain can be intelligent and capable of some level of free thinking. We all know about crows and their street smarts too.