on saturday, i bought a baby duck. which, i know i should have bought two, but i wanted him to be more of a pet. well, he was completely fine until today. when i got home from school, i got him out with my chick, & he was just kind of sitting there. so i ran some water in the sink, & he still just sit there in the water. & then he started rocking back & forth. & now, he cant walk at all. & i have no idea what could be causing this, or if its contagious, or what. helpp?