I can get them to respond to individual names and they seem to recognize same names even when pronounced by other speakers. I have not explored how well they can tell different vowels and consenants apart. Their language is a lot more complex than the limited research indicates at least in terms of single concept meanings. I have not seen evidence for any syntax, sounds strong together in particular order to have meaning. Many domestic breeds seem to have reduced vocabularies relative to my games and red jungle fowl. The latter might prove to be alot more intelligent than people give chickens credit for being.