The marsh section represents a large walk-through mesh aviary with several waterfowl species. It is quite impressive (although somewhat lacking in birds) and reminiscent of the netted walk-through aviary that you've seen at Woodland Park Zoo.
An excerpt from my 2010 review:
The third and final section of the zoo is an 8.5 acre children’s area that is quite pleasant and geared specifically towards children. There are some cute and innovative ideas, such as lilypads across an actual waterway, an underwater river otter tunnel, a giant tree with a slide in it, pop-up tunnels in an enclosure, a cave with plenty of small critters in terrariums, and of course the obligatory farmyard. It seems as if every single zoo that I visit has a red barn, a petting zoo and a bunch of domestic animals in standard farmyard cubicles. This large kid’s zone is divided up into 7 areas: Bog, Marsh, Stream, Cave, Woodlands, Meadow and Farmyard.
