The serpent said to the frog, today I was cursed by a Brahmin. So many frogs went near the snake and asked for its sadness. It said "when I was about to attack a frog, it jumped out and joined in a group of Brahmins and escaped. I felt bad and gave a bite to a Brahmin's son, who died immediately, then the Brahmin cursed me to become a vehicle to carry all the frogs". So, I am your vehicle to carry you all, where ever you please to go", please ride on me.