Over the Fence
There are a few places where you can view bits of London Zoo from the outside. The Regents Canal has a few areas, but this one, just off the Outer Circle along St Marks Square (which is a long, straight road through the park, and not a square) is probably the best. From here, you can catch a glimpse of the new penguin enclosure. You'll see where - the ground is rather worn by the fence.