This 1 1/2 yr old wyandotte has an enlarged crop, and stretches her neck and bobbs her head, this was a reoccurring symptom for this bird. She also is lethargic and off her feed, and her comb was pale. After giving her some "glyconutrients" for people and a vinegar water solution, and isolating her, as I did before, she is now responding. She was also off laying for some time. Has anyone encountered this too? Or know what causes it?