I just noticed one of my ganders looks to be having trouble with I think something caught in his throat. He is swallowing a lot and every so often will seem to gag and shake his head as if trying to dislodge something. last time he had white colored fluid come out when he was shaking. He doesn't appear to be in distress other than what I've described. I was able to catch him at one point and tried to open his beak to look and was not able to even get a look as he is rather opposed to the idea. He let me know by giving me a good bite on my fingers. Now what? I have no experience with this and obviously do not have a clue on what I should do.