Ever-changing Exhibits:

The exhibit I hear people talk about the most in regards to how quickly it changes is the Tide Pool in the Nobel Aquatics Center (Aquaticus,)

Bahama Sea Star (underside w/ mouth, eye-sensors and tube-feet.)
Photo by Jamie West.

First constructed in the late 80's, the Tide Pool held a variety of animals, such as fish, sponges, sea urchins and star fish. The exhibit was open to the public to touch.

After complications with the life expectancy of the animals, zoo staff decided to shut down the Tide Pool for many years, leaving the exhibit empty.

Horseshoe Crab. Photo by Jamie West.

In 2013, the Tide Pool was re-opened in the form of Explore a Seashore. The touch pool was gated, allowing zoo staff to control how many people could get to the animals at any given moment. Staff was also present to educate guests on how to properly touch the animals, as well as give interesting facts, such as the Horseshoe crabs that have blue blood, and Starfish don't have brains!

Bahama Sea Star. Photo by Jamie West.

Currently, 2014, the zoo staff wanted to try something new, and now the Tide Pool is an interactive I Spy game, where little ones can search for plastic replicas of all the animals unique to the beaches on the coasts of the U.S.

Explore a Seashore is free to enjoy. (You might even get a visit from a Sea Lion at the window!)

California Sea Lion. Photo by Jamie West.