I have two 4-week old Khaki Campbell ducklings that now follow me around the yard and quack very loudly till they hear my voice and find me. What is really funny is that they respond to the word "what" more than anything else. I say "what" and they cock their heads to the side (like a dog listening) then make a bee line to me. They don't let me get too close yet but I can't be more than 4 feet away either. It's rather funny to watch because my son (2 yr) and then the ducklings follow me all over they place. When I do go into the house, they follow as far as they can then "park" and wait for my return outside. Lord help me when they figure out how to climb steps and can follow me into the house. I now spend a lot more time outside then I used to.