 Given that many of the animals in America seem to have a mutation, what is one probable explanation of what may have caused the mutations given that World War III had recently ended?
Not even forever [Transcriber's Note: This etext was produced from Worlds of If Science Fiction, April 1958. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] They had no place in the dust-caked, tired body, yet there they were, seeking, always seeking—searching the clear horizon, and never seeming to find what they sought. They were nearing a river; the water would be welcome on tired bodies and dry throats. Then both man and horse plunged headlong into the waiting torrent, deep into the cool embrace of the clear liquid. They soaked it into their pores and drank deeply of it, feeling life going once more through their veins. Refreshed and momentarily content, he sat staring into the dying fire, seeing the bright glowing coals as living fingers clutching at the wood in consuming embrace, taking all and returning nothing but ashes. His body sagged, and blood seemed to fill his brain, bathing it in a gentle, warm flood. Images began to appear, drawn from inexhaustible files, wherein are kept all thoughts, past, present, and future.... World War III had been declared, and he had enlisted, receiving his old rank of captain. It caught the shadows of the fire and reflected them, greatly magnified, over the room. When he opened it, he found a picture of her in one side, and in the other a picture of the children.
 There was a nuclear weapon attack in America from an opposing country that led to mutations in animals there.
 America experienced a famine that led to animals eating trash and experiencing mutations in later generations.  There was a nuclear weapon attack in America from an opposing country that led to mutations in animals there.  America spent all its money on war and neglected its land, which led to mutations in the animals.  Most of World War III was fought in America, so all the gun powder and resources caused mutations in the animals.