How do I know if my duck is happy? He is a single duck. I take him to a house across from my work everyday, they have 1female mallard and lots of chicken hens. They are in separate kennels but can see each other. And the female free ranges so she walks along my ducks cage. I'm going to try to introduce them this weekend. It's been 2 weeks. My duck has only been around other ducks 2 times and he never went near them just kept his distance. I guess I just want to know how do I know if he is happy or not.