Laughing at the thriving pit, crisscrossing the north and south, what is the zodiac?

Laughing proudly and thriving, wandering around at home, is a zodiac mouse. There is a folk saying that "the mouse bites the sky", so the mouse is called "the sky" and is also listed as the first in the zodiac. Walking south and north means running around in the zodiac without stopping your feet. Rats are extremely fertile. If they live in the north and south, it shows that they have many children and prosperous people. Therefore, laughing in the pit of wealth, wandering north and south, is the zodiac mouse.