The Discovery Zoo is an indoor zoo that is fully accredited by the Association of Zoos and Aquariums (AZA) that showcases mammals, reptiles, birds, and amphibians with special adaptations for survival. The Discovery Zoo is home to over 150 animals including a Linne's two-toed sloth, bat-eared foxes, North American river otters, African meerkats, and more recently a Mertens's water monitor named Nessie. Although the museum does not itself rehabilitate injured animals, many of the animals, including the zoo's Virginia opossum, came to the zoo after being injured in the wild and rehabilitated elsewhere, and would be unable to survive on their own. Two otters currently live in the zoo, and are part of a national breeding program; their names are Eno and Sikwa. The Discovery zoo was renovated in 2010 to expand its capacity and recreate a new style to the zoo. The project also included the addition of around 18 new species of animals to the zoo. The Boonshoft Museum of Discovery is one of only four museums in the United States that are accredited as an official zoo. The renovation project came at a cost of $1 million.