It's a hard and a solitary life being a penguin egg with only your Mum/Dad's webbed feet to keep you off the ice. Then if you eventually hatch you find yourself to be an only child, surrounded by hundreds of other only children who look like they could be your twin. So in those circumstances it is hard to establish ones own identity and self awareness, and it is easy to become aggressive for no reason due to limited understanding of your surroundings. Eventually you may grow up and have eggs of your own, that is if you don't become a PenguinBurger for some passing killer whale!
Giok