Where are the fences, wire, poles, beams, walls, etc? They are invisible, including a dry moat that separates the river otters from the rocky mountain goats. There are photos on ZooChat with goats in the background while the beautiful otter exhibit is in the foreground. Brilliant design, and visitors appreciate the natural environment that has been created in the heart of downtown Seattle. Sure, it costs big bucks to replicate nature but it is worth the cost.
There are a number of other viewing opportunities to see the goats other than over the otters, as the mountain to the right of the exhibit is much larger than it appears in the photo.