The Thing in the Attic by James Blish: Recent Episodes

Honath the Pursemaker is a heretic. He doesn’t believe the stories in the Book of Laws which claims giants created his tree-dwelling race. He makes his opinion known and is banished with his infidel friends to the floor of the jungle where dangers abound. Perhaps he’ll find some truth down there. – The Thing in the Attic is one of Blish’s Pantropy tales and was first published in the July, 1954 edition of If, Worlds of Science Fiction magazine.