We have a single pilgrim goose-- about two months old. He is a family favorite, but something is really off today. He's not interested in feed (which never happens) has tripped several times, but, what worries me the most, every time he bends his neck it looks like all the water I've been giving him just comes pouring out of his open beak. What would cause this? Could he have gotten into something bad to eat, like a string? Is there anything I can do to help? It has been really hot lately, so he and the four muscovies pant a lot, but they have been ok until this behavior on the goose's part today...