Hi! So we've got two female ducks (khaki Campbell and white Campbell) about 8 or 9 months old we think. Both laying. Both seem happy. However the khaki has been seen to nibble at the white and pull feathers. Daphne (white) doesn't seem to bothered. And they get on well the rest of the time. Now Deefer (khaki) has started standing on Daphne in their water tray nibbles her neck and tries to push her head in the water. Again Daphne doesn't seem bothered. Now my question is: do you think it's some kind of mating behaviour? Play? Dominance? Should we be intervening?