Visitors who listen carefully might hear Lou Lou, a 9-month-old two-toed sloth, snacking on a sweet potato and rice mixture. Wait for it, and she'll slowly blink or wink her chestnut-colored eyes.
There are other slow-moving critters to examine, including snakes, frogs, scorpions and lizards. A handler might even remove some of them from their enclosures so visitors can get an even closer look.
"Survival of the Slowest" opens Saturday and runs through Sept. 20.