I am a little worried about my ducks, their poop color keeps changing, is this normal? Ive had a duck before these 3 but this never happened. One day it will be brown, the next white, then green. Whats going on? Is it just what they are eating? They eat corn, bugs, lettuce and other things including my goat food (silly ducks). And then one day it will be solid, the next totally liquid.