The children run ahead, squealing with delight. Their parents lag behind holding the children's brightly colored balloons and carrying the remnants of the half-eaten cotton candy. The family stops to let the children ride the minitrain and take pictures together under the tree. They walk hand- in-hand toward the exit, stopping first at the gift shop where they each splurge on a treat to remind them of the day's adventure. Although this may sound like a typical scene from the local amusement park, it's actually the city zoo. All that forg ....