It sounds like you have discovered a very tame Wood duck. Perhaps emboldened by the Mallard mob that so easily accepts human surveillance. The ones that I sometimes encounter in the Rouge are very skittish and will relocate at the slightest intrusion. The only occasions I was ever able to get reasonable close was by covering myself in a camo drape and remaining motionless. Even then, the ducks suspected something was amiss, although their reaction to my presence was more a matter of curiosity than consternation. They would come close enough to appraise my obscure form, often passing back and forth searching for recognition and the meaning of those noisy clicks.