God created the donkey and said to him: "You you're an ass.

[Harry]

God created the donkey and said to him: "You
you're an ass. You will work constantly from morning to evening and carry heavy things on your back. You will eat grass and have little intelligence. And you will live fifty years." Then the donkey replied: "Living like this for fifty years is far too long, please don't give me more than thirty years!" And it was like that.

Then God created the dog and said to him:

"You are a dog. You will guard the goods of humanity, whose most devoted friend you will be. You will eat what man leaves and live for 25 years." The dog replied, "God, living like this for 25 years is too much. Please no more than ten years!" And it was like that.

Then God created the monkey and said, "You are a monkey. You shall swing from tree to tree and act like an idiot. You will be funny and you shall live like this for twenty years." The monkey said, "God, living as the world's clown for twenty years is too much. Please don't give me more than ten years." And it was like that.

Finally, God created the man and said to him: "You are a man, the only rational creature that will inhabit the earth. You will use your intelligence to subjugate the other creatures. You will rule the earth and for twenty live for years!"
Then the man said, "God, being a man for just twenty years is not enough. Please give me the twenty years that the donkey refused, the fifteen of the dog and the ten of the monkey."

And so God caused the man to live as a man for twenty years, then get married and work as a donkey from morning to night for thirty years, carrying heavy loads. Then he will have children and live like a dog for fifteen years, guarding the house and eating what the family leaves. Then, in old age, he lives as a monkey for ten years, acting like an idiot and amusing his grandchildren.

And that's how it is to this day...