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

Little Baby Chickie was found as an egg in the forest by a strange Magi dragon. The Magi dragon took it to its cave, and realizing it was not a dragon egg, teleported it to this cave. She acts like a dragon, eating meat like the other dragons and trying unsuccessfully to fly. As she is aware of her size she thinks she is but a Pygmy dragon. Chickie is named that because the dragons had not expected her to grow larger than a chick, never having seen a chicken before. It seems like she represents the whole cave of dragons, like a mascot.