The issue is that human language is visibly a tier above just "culturally defined communication". Lots of mammals have some sort of learned 'language' in that t

The issue is that human language is visibly a tier above just "culturally defined communication". Lots of mammals have some sort of learned 'language' in that they associate sounds or actions with certain meanings, cats and dogs can even be taught to communicate with humans by pressing buttons that say human words. However it's obvious that human language has much more complexity than just that. Barring undeniable and extraordinary evidence of communication of similar complexity to humans, the claim that cetaceans have language in the human sense remains extraordinary.