Hi, I just adopted a 1.5 years old Khaki Campbell with a swollen left hard lump in the chest. At first I thought it could be crop, but I read that crop is supposed to be right side? The previous owner has been feeding it with cat kibbles. Duck is alert, and active but not eating. Drinking only. Any idea what I should do? Is this due to too much protein? And it doesn’t seem to quack much.