I got some eggs off ebay and they were due to hatch. Only one started hatching and it hadn't made any progress so i decided it was stuck. As i was picking at some of the shell, i noticed its eye was covered in this yellow crusty stuff. The egg was dripping yellow liquid. We got it out and its loud and fully alive but we don't know what the goo is...weve hatched hundreds of chicks and never seen anything like it! Anybody know what it is?