The answer is no and that include humans as we do not only use spoken words (I think speaking is only 10% of our communication), in fact our body language often gives away what we are really feeling, in the same way that an animal can recognise the body language of another animal of the same species, whether it looking for a fight or friendly or wants to mate.. methods the same can be same for humans.
Prey animals are not quite so afraid of a predator if it is showing no interest in them
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marialovesmusic commented on :
that is really interesting:)