<P> The Lorax was Dr. Seuss' personal favorite of his books . He was able to create a story addressing economic and environmental issues without it being dull . "The Lorax," he once explained, "came out of me being angry . In The Lorax I was out to attack what I think are evil things and let the chips fall where they might ." </P> <P> A boy living in a polluted area visits a strange isolated man called the Once - ler on the Street of the Lifted Lorax . The boy pays the Once - ler fifteen cents, a nail, and the shell of a great - great - great grandfather snail to hear the legend of how the Lorax was lifted away . </P> <P> The Once - ler tells the boy of his arrival in a beautiful valley containing a forest of Truffula trees and a range of animals . The Once - ler, having long searched for such a tree as the Truffula, chops one down and uses its silk - like foliage to knit a Thneed, an impossibly versatile garment . The Lorax, who "speaks for the trees" as they have no tongues, emerges from the stump of the Truffula and voices his disapproval both of the sacrifice of the tree and of the Thneed itself . However, the first other person to happen by purchases the Thneed for $3.98, so the Once - ler is encouraged and starts a business making and selling Thneeds . </P> <P> The Once - ler's small shop soon grows into a factory . The Once - ler's relatives all come to work for him and new vehicles and equipment are brought in to log the Truffula forest and ship out Thneeds . The Lorax appears again to report that the small bear - like Bar - ba - loots, who eat Truffula fruits, are short of food and must be sent away to find more . The Lorax later returns to complain that the factory has polluted the air and the water, forcing the Swomee - Swans and Humming - Fish to migrate as well . The Once - ler is unrepentant and defiantly tells the Lorax that he will keep on "biggering" his business, but at that moment one of his machines fells the very last Truffula tree . </P>

What are the trees from the lorax called