Midworld
Alan Dean Foster
 Midworld is a planet entirely covered by a rain forest three-quarters of a kilometer (almost half a mile) tall. Born is a member of the primitive society that has lived peacefully on Midworld for hundreds of years, they keep the careful natural balance of the jungle so that all may live. The world is disrupted by the arrival of an exploitative human company from Earth whose representatives know nothing of the delicate stability of the planet. Born helps two of them, one of whom is a female botanist, by leading them safely through parts of the relentlessly hostile jungle. The portions of the jungle near the ground are full of bioluminescent growths. The natives live in a gigantic tree called the Home Tree. When one of them dies, they are ceremonially buried in the Home Tree. Most of the animals have six legs and three eyes. One flying creature, called a sky-devil, is a large reptile-like creature that has air intakes under its wings. Each of the locals forms a lifetime bond with a powerful predator called a furcot. The natives hunt with poison darts. All of the life on the planet is linked together in a vast neurological network centered on the plant life. The natives can sort of communicate with this network through a process they call "emfoling". Eventually Born realizes that he has made a grave error in assisting the aliens who have plans for life that will completely kill the jungle and Born's people. Enlisting the aid of native plant and animal lifeforms, and their furcots, he and a powerful warrior from his tribe named Losting (both of whom are in love with the tribe's most beautiful girl) destroy the invaders' base. In the course of the fight the other warrior is killed.