I have 4 Muscovy ducks. The head bobbing is a greeting and unlike most other breeds of ducks, they will wag their tails like a dog in excitement. I also have 2 Pekins and 2 khakis but my Muscovy are the more friendly. They have a personality all their own. They can be mischievous and nosey. It seems they must know what you are doing and then they want to do it too. I have one (Shermie a female) who comes to the front door, knocks, patiently waits for me to open the door then just comes right in for an afternoon nap with our old dog. Then she goes to the door and "pips" to be left back outside. Never pooping inside either. Great ducks! Our male "hisses" and coughs sounding like an old smoker. They aren't the prettiest ducks but I'm finding they are quiet, funny, great layers,good for insect control and just all around a perfect duck. I hope you enjoy yours as much as we do ours.