These are just hints to similar behaviour, _no definite proof_ is available and impossible to obtain.

Which is why behavioural biologists don't even go down that path of "humanizing" animals - all they do is link certain behaviour to certain actions (famous example: anal-sniffing as sexual behaviour in guinea-pigs or dogs). Looking at animals through the "human glass" can lead to some insights, but can certainly lead to terribly wrong results, too:

It's like overfitting a statistical model, you'll get noise where you expect results.