Denver Zoo is a pioneer when it comes to providing animals with natural environments. The zoo is distinctive in that there are no walls or fences separating the animals. The guests in cages are humans! They enjoy an unrestricted lifestyle! A few of the attractions on show include the Toyota Elephant Passage, Giraffe Encounter, Tropical Discovery, Bird World, Primate Panorama, Bear Mountain, and Pachyderms and Felines. The zoo hosts a variety of exhibitions and feedings for the entertainment of visitors. Another choice is to go on a guided tour. There is no need to stand in line when you can purchase Denver Zoo tickets online.