Aransas is considered the "crown jewel" of the National Wildlife Refuge system. It is the only summering ground for the endangered Whooping Crane and home to large colonies of birds including Pelicans, Cranes, Herons and Egrets. The Refuge has a number of small walking trails and also has a scenic 10 mile drive through its interior. Wild Boar, Alligators and Armadillo can also be seen at the refuge.