hi there, my ducks are silver appleyard crosses,i have ten of those, and 6 that i just hatched from a friend and i dont know what they are. my appleyards are 11-12 weeks old, and they are the first i have ever had, they used to live with my pig but then we dug them a larger pond and moved them into it about 2 weeks ago, they have just started showing signs of losing feathers around there breast area. Is this normal? they all came to me for breakfast, (they get fed at regular times and are waiting for me before i get there) but at their afternoon feed they all came bar one, and she sat in the pond and wouldn't get out, i just gave them their last feed and she still didnt come so i fished her out and checked her over, she cant quack, she just sounds like she is wheezing, she wont eat either. she doesnt get distressed either when i hold her, normally they flap around for a second before calming down, but she just watched me. could it be she just swallowed a small stone or something or is it worse, should i check out my other ducks too? any advice would be greatly appreciated.