In the spring of 2013, the Species Survival Plan allowed two of the zoo's penguins to breed and visitors could view the baby penguin later that fall. The exhibit has two observing areas, one of which is a bridge overlooking the entire enclosure, and the other allows visitors to watch the penguins swim underwater. This exhibit is home to a troop of Japanese macaques. Since these animals are a part of the Species Survival Plan, infant macaques can be seen almost every year. The education building houses reptiles, arachnids, amphibians, and one emperor scorpion. Species of reptiles include bearded dragon, red-tailed boa, ball python, blue-tongued skink, and European glass lizard. Two amphibian species are on display, the Amazon milky tree frog and the African bullfrog. There are two species of arachnids, the Chilean rose hair tarantula and the orange baboon tarantula. The tortoise den is home to a male and a female Aldabra tortoise, which are native exclusively to the Aldabra Atoll. The den has an outdoor enclosure and a tortoise shell-shaped den. The Wisconsin Trail is home to many native species and a few from surrounding areas of the country, including the North American otter, the wild turkey, the American black bear, the red fox, the red wolf, the cougar, the helmeted guineafowl, the ruffed grouse, the chukar partridge, the ring-necked pheasant, the bobcat, the Canada lynx, the white-tailed deer, the American badger, the raccoon, and the porcupine. Although not native to the Western Hemisphere, the red panda is also found on the Wisconsin Trail. Located in the northeastern corner of the zoo, visitors can travel up to the Riley Building to view animals on the Northern Trail, including mammals such as the black-footed ferret, the cotton-top tamarin, and the moose, as well as birds such as the burrowing owl and the black-necked stilt. Two large tanks on the Northern trail contain northern pike, largemouth bass, and yellow perch. The Riley Building also houses two species of frogs, the green frog and the American bullfrog. The North American Aviary houses birds that are found locally or in other areas of the United States. Three of the largest birds in the aviary are the American white pelican, bald eagle, and the turkey vulture.