Hello, I have some friends who are in Greece at the moment, they have found two baby pigeons about 17 days old. One has got a hard mass in its crop, its not vomiting but is apparently constantly drooling. Everywhere is closed because its a Sunday, they have some apple cider vinegar should they give that to the baby? is it sour crop? I have read lots of descriptions and causes but it seems many crop ailments cause and are described as sour crop. I have told them to feed either very liquid food or just water with sugar and some salt in. Can someone help please!