The Scorpion and the Frog is an animal fable that seems to have first emerged in 1954. On account of its dark morality, there have been many references to it since then in popular culture, including in notable films, television shows, and books.
A scorpion asks a frog to carry it across a river. The frog hesitates, afraid of being stung, but the scorpion argues that if it did so, they would both drown. Considering this, the frog agrees, but midway across the river the scorpion does indeed sting the frog, dooming them both. When the frog asks the scorpion why, the scorpion replies that it was in its nature to do so.
Though the fable is recent, its outlook that certain natures cannot be reformed was common in ancient times, as in Aesop's fable of The Farmer and the Viper. Here the scorpion’s reply indicates that what is fundamentally vicious will not change.
The origin of the fable is somewhat uncertain. One of the earliest known appearances of the fable is in the 1954 script of Orson Welles' film Mr. Arkadin. Although there are similarities with the fable of The Frog and the Mouse, the story here has more in common with later variants in which a scorpion appears that emerged in Asia during the Middle Ages, notably a story about a tortoise and scorpion.
A study published in a German journal in 2011 can find no connection between that fable and the Indian tradition of the Panchatantra. Whereas the original Sanskrit work and its early translations do not contain any fable resembling The Scorpion and the Frog, a later fable, The Scorpion and the Turtle, is to be found interpolated in post-Islamic variants of the Panchatantra. In The Scorpion and the Turtle, the turtle drowns the scorpion after the scorpion tries but fails to sting the turtle through its hard shell. The study suggests that the interpolation occurred between the 12th and 13th centuries in the Persian language area and may offer a new starting point for further research on the question of the fable's origin.
The fable relies to a significant extent on the idea of the creature's nature, which is of ancient reputation. Attesting to this, Oliver Goldsmith dedicated a chapter to "The Scorpion and its Varieties" in A History of the Earth and Animated Nature (1774) and observes that "It is certain that no animal in the creation seems endued with such an irascible nature...I have seen them attempt to sting a stick when put near them; and attack a mouse or a frog, when those animals were far from offering any injury."