[tuatoru]

I seem to recall an experiment with corvids (crows) that showed that they can figure out whether or not another crow can or cannot see a crow treat, based on the different angle of view.

In human children this ability (to realise that other people have their own point of view) is called "theory of mind", IIRC.

IOW crows can think about what other crows are thinking.

[SamoyedFurFluff]

Several animals display theory of mind, including the variety of pig common in farming.