2 days ago, my 4 african goslings turned a month old, and overnight they turned into aggressive monsters with each other. They are walking up and biting the other on the wing, which in turn makes the other bite the first one on the neck. The bitten one runs around screaming with the other gosling clamped down on his neck. They are getting rather bloody on their wings. Over the weekend, they have been moved outside into a large pen, introduced to my adult pair, who immediately fell in love and have adopted them.... and have plenty of new stimulation... yet they keep beating the crap out of each other. I am used to seeing dominance games with horses, and usually the injuries are only superficial and I leave them be to sort out the herd. My instinct says the goslings are doing the same thing... but will they cause serious injury to each other???