What was the first egg in Adopt Me?

Could you please elaborate on the history of the first egg in Adopt Me? I'm particularly interested in knowing what made it unique and how it was introduced into the game. Was it a special event or a milestone achievement that led to its creation? Additionally, what kind of excitement or anticipation did it generate among the players at the time? I'm curious to understand the significance of this first egg in the context of the game's development and community.