There was also a recent story about a beluga whale that could speak and understand language. In my opinion, it is not as far fetched some people might think. Most animals are naturally social, and social settings bring with them the need to communicate with others.
I am sure that animals want to be sociable and it is clear that birds are superb mimics of the sounds around them. However, the article is a subjective assessment of the animals speech. I would regard this as pseudoscience unless one can perform an experiment to establish, in a double blind study, what the sounds are. I would also count all the sounds the animal makes in context. Is it possible that it also speaks Serbo Croat words if Serbs or Croats listened to its speech patterns? Maybe...I don't know but I would be wary of agreeing with the conclusions of the researchers.