Like many other giant snakes, boa constrictors live in tropical rain forests, but they also slither through grasslands, farmers fields, and even along desert rocks and sands. World's Largest Snakes series. Interest Level: 3-6 Reading Level: 5.7 ATOS Book Level: 5.1 AR Interest Level: LG AR Points: .5 AR Quiz: 66391EN Guided Reading Level: P.