I have four ducklings, one is four weeks old this Thursday and the other three will be three weeks old this Thursday. Two of the ducklings (the older) and one younger talk all the time, which I can only describe as "chatting" it is three or four sets of sounds that are repeated quite often. The other two ducklings hardly say anything. Does this speak to personality or gender? I read quite a bit on sexing by quack but they are not there yet. No quacking, just this high pitched chatting. Thank you!