Well, the chick grew up into a chicken, but you’re still not sure how the egg got into that cave...

Shinobi Chicken is no ordinary pair of drumsticks; she's a ninja. A ninja chicken, to be precise. She has insane ninjutsu skills and loves sneaking over rooftops and through dark forests. These skills are vital to the success of her mission: to eliminate these foul aliens, called Space Chickens. Like them, she believes they're an army from outer space, but unlike them, she doesn't think their presence on planet Earth is a good thing. She loathes them. Fortunately her ninja chicken army is growing fast. Being a hen, she sometimes can't suppress her motherly feelings; at such moments she steals the first egg she can sneak away with and sets to brooding it in some secret place. Whether this is a chicken or dragon egg doesn't matter to her, with the result that some young dragons end up with thoroughly confused identities, believing their mother to be a tiny white chicken instead of a tree-tall dragoness.