Adrian's right, rhythm is the thing that really sets them apart. Another word to describe it is attitude. A turkey (especially a hen) clucks when it wants to get another turkey's attention or let them know where she is. It is relaxed or maybe curious. He/she putts when he is alarmed. There is urgency to it ... and it gets softer with each putt --'cause he's leaving! Also, when he putts, that's ALL you hear. There are no yelps or purrs or gobbles mixed in. You may hear just 1 putt or you may hear 5 minutes of nothing but putts. But, believe me, when you hear a putt, you'll know it!