I have 2 geese that i hatched, lemon and waldo. I was watchn them eat and right before they would take the first bite they will throw up water. Is anything wrong with them?
If they were deprived of water for a period of time then given some and tanked up on it they might just be urping a little up. I've seen that before and nothing is wrong unless they continue to do it frequently and have other symptoms or they are off feed.
I don't think this is the same with your case but they will sometimes do this if they overeat too. Right after eating a lot (being naughty and eating more than they aught), I've noticed that my emdens will drink water and it will come back out sometimes if put their heads to the ground to look around for tidbits or something.
Are you sure they were throwing up? Geese need liquid to swallow and I've seen mine take a drink and then eat pellets. Some of the drink runs out of their mouths when they go for the bite of pellets.