Alien (You'll Never Go Home Again)

This is an unnamed, non-spacefaring civilization of humanoids which inhabit an unnamed jungle planet.

Biology
Members of this species have a generally humanoid body plan, but don't actually look like Humans. Instead, they somewhat resemble man-sized matchstick figures, all black and thin, with pumpkin-shaped heads and bright eyes.

Culture and society
They're peaceful creatures which live in small villages. They don't wear clothes and their habitations are huts. Their technology is stuck in the stone age. There is a mysterious force operating on their homeworld which prevents the prolonged use of metal-based equipment, even though there are plenty of metals available.

Appearances

 * "You'll Never Go Home Again", by Clifford D. Simak (1951)