According to the ancient book Yi Shu Ji, hydra became a dragon after 500 years, a dragon after 1000 years, a horned dragon after 500 years and a Ying Long after 1000 years.

In other words, a water snake, after practicing for 500 years, becomes a dragon; After practicing for a thousand years, Xiaolong became a dragon, which should be an adult dragon. In another 500 years, it will become a horned ceratosaurus. In another thousand years, there will be wings called Ying Long. Ying Long should be the most advanced dragon.

Extended data:

About other folklore that can become dragons;

First, carp yue longmen.

This is so familiar. It is said that carp has a black spot on its forehead, which is the mark that it landed on the stone without jumping over the dragon gate. Li Bai also wrote a poem: Three-foot-long Yellow River carp, originally living in Jin Meng, failed to succeed and came back with all the fish.

This carp yue longmen, there are places, just like the college entrance examination now, there are places for enrollment. In a year, only 72 carp can jump over the Longmen and become dragons. How did it melt? Yue longmen, a carp, will burn its tail one day and become a dragon.

Second, swim fish and drink urine to become a dragon

Drink urine and become a dragon. This urine is not ordinary urine, but white urine in The Journey to the West. In the book, Bai said this: The horse jumped up, spit out his words and shouted, Brother, don't you know? I was originally a flying dragon in the West Sea. Because I broke the dogma, Guanyin Bodhisattva saved me, sawed my horn, peeled my scales, turned me into a horse, and took my master to the Western Heaven to learn Buddhist scriptures, which was a crime.

If I pee in the water, I will swim in the water and eat Jackie Chan. Pee over the mountain, the grass in the mountain tastes good, turn it into ganoderma lucidum, and the fairy boy picks it to prolong life. How can I give up in this secular place?

Baidu encyclopedia-dragon