Walking through London today, you'll doubtlessly hear cacophonous traffic, sirens, construction, countless languages -- all the noises familiar to big cities... but, not too long ago, it would also have been normal to hear the roars of large animals in certain neighborhoods. In the first part of this two-part series, the guys explore the factors that led London to become a world-class hub for the exotic animal trade, often to the detriment of the animals (and the occasional spectator).