The Great Qin Dynasty: The egg of the Black Bird was revered as a national guardian beast.

The thirty-fourth year of the First Emperor's reign.
A meteorite fell from the sky, and it was engraved with the seven characters "When the First Emperor died, the land was divided".
The First Emperor was furious and ordered the stone to be destroyed. Unexpectedly, when the meteorite broke apart, there was an egg inside.
The official in charge of disposing of the stone dared not object, reported it to the emperor, and sent the egg to Xianyang.
Finally, the Grand Astrologer consulted ancient books and relied on historical records to reach an astonishing conclusion: the egg was actually the egg of the Black Bird!
……
Xuan Ye transmigrated and woke up to find himself trapped in a dark place.
Furthermore, they discovered that they had become creatures with sharp claws, wings, and long, thin beaks.
Just then, they overheard a conversation outside and realized that they were actually in the Qin Dynasty.
As for himself, he actually transmigrated and became the divine bird, the Xuan Bird!
From then on, Xuan Ye was revered by the First Emperor as the national guardian beast, the Heavenly Mandate Black Bird, and successfully subdued.