A scorpion and a frog meet on the bank of a babbling stream. It’s too treacherous to cross, so the scorpion nicely asks the frog to carry him across on its back. This makes the frog a little suspicious. It asks, “How do I know you won’t sting me?” The scorpion says, “Because if I do, I will die too.”

That sound reasoning relaxes the frog’s nerves. So he allows the scorpion to climb aboard and they shove off across the flowing water.

They get halfway across the stream and the scorpion stings the frog directly in the middle of his back. The frog feels the onset of the scorpion’s poison and starts to sink. He manages one dying breath: “Why?!” And the scorpion replies: “It’s my nature…”

Visual Telling of the Scorpion and the Frog

More about the animal based fable: https://en.wikipedia.org/wiki/The_Scorpion_and_the_Frog