How are you trying to give it treats? If the duckling is freaking out as you describe, hand -feeding won't help much because under this circumstances a duck is just not in the mood to take treats.
I would just throw in the food without any further interaction than showing yourself to it. Improvement can take its time.
And you need to keep in mind that if the crest is involved in it you are facing a problem that might as well never be solved.
I would just throw in the food without any further interaction than showing yourself to it. Improvement can take its time.
And you need to keep in mind that if the crest is involved in it you are facing a problem that might as well never be solved.