Isolated zebra finches start a new colony

at first.If isolated zebra finches start a new colony,the young birds pick up the isolate song from their parents.But the song changes from generation to generation.And after a few iterations,the melody actually starts to resemble the cultured songs sung by zebra finches in the wild.Something about the learning process must be hardwired, too,drawing the birds towards the same song patterns again and again.