Mobile is known by airline pilots as the "city under the trees" mostly due to the oak trees that line our streets. The summer afternoon thunderstorms and late winter/early spring showers that make Mobile the rainiest city in America also help create the perfect environment for growing monster-sized oak trees. Though the trees used to line Mobile's streets in the early years were the chinaberry tree (also known as the Pride of India) due to its fast growth, they were soon replaced by the native live oaks. Today, virtually every major corridor of the old city has a live oak canopy.