Creeks & Crawdads

From the back cover:

The human race has destroyed itself. Nuclear war has erased all human life form the face of the earth. Only the cunning, lucky, or well prepared had survived the initial bombs. They all died shortly thereafter. There were no mutants, no crazed war vets returning home, no cryogenic sleepers trying to change civilization. Not even the vultures to pick up their bones. Consider then the plight of Cambaris, the common crawdad. For in the radioactive hell that followed the war it found itself evolving towards intelligence. Well, part of the way. No matter how smart a crawdad gets, it's still pretty stupid.

Nonetheless, despite their basic stupidity, they set forth to rebuild a shattered world, to relight the torch of civilization, to get hungry, find lunch, and forget about everything else.