The Indianapolis Zoo Welcomes Extreme Species - Sloths and Snakes. The two very different exhibits debut Memorial Day weekend and feature two-toed sloths and extreme snakes. The MISTery Sloth Park and Extreme Snakes exhibit officially open Saturday, May 25. MISTery Park offers lush landscapes, tall grasses, and cooling fog while nature sounds play in the background. Guests can get stand just feet away from the sloths for that perfect selfie. #IndySlothie