It is not scientific to say that they are hungry when they're hunting and they're tired when their tongues are hanging out, and then say when they're playing with their children and acting joyful and happy, we have no idea if they can possibly be experiencing anything.
Non é científico dicir que cando teñen fame, cazan ou que están cansos  cando as súas linguas colgan e que cando xogan coas súas crías  e están ledos e felices non temos nin idea  de se están a experimentar algo.