Clifford D Simak's "The World That Couldn't Be" (novelette, first contact, free): Hunting an unkillable "animal"
Only, the natives are very superstitious about it, & consider it unkillable. But Duncan is adamant. Three long days of tracking Cytha, & Duncan is coming around to see his query with fresh eyes...
Fact sheet.First published: Galaxy, January 1958.
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Related: Stories of Clifford D Simak.