Herbert L Cooper's "A Nice Little Niche" (short story, ecology, free): When vitamin K craving alien bacteria infected human guts
Story summary.This is a classic Campbell puzzle story. Human explorers have arrived on a very desirable world. Only there is evidence that there once were mammalian animals here that died out a few hundred thousand years ago.
A doctor on board will puzzle things out, & barely save the humans on board...
Fact sheet.First published: Astounding, March 1956.
Download full text as part of the scans of Astounding (British edition), August 1956.
Among the stories from Astounding/Analog issues edited by John Campbell.