fantasy: i did not raise the divine beasts

Xiao Changtian was a zoo keeper. He did not expect to get transmigrated with his zoo. However, in the new world, he had no power but all his animals had become celestial beasts. One day, the empress was heavily injured and was able to recover after consuming the egg of a tortoise from him. After she had learned that it was actually the egg of the Black Tortoise, she insisted on becoming his servant.
“The egg that this man gave me was the egg of the Black Tortoise?”
“Wait! Is that the legendary Phoenix resting on the tree?”
“What that unique beast that’s black and white? Why have I not seen it before?”