Wildlife abounds at Eldon Hazlet SRA, in part due to the natural resource management program implemented at the park. Various types of warm-season grasses and legumes are planted to provide supplemental cover and food for wildlife. Brush piles and nest structures, such as bluebird boxes, have been placed throughout the site. The restoration of natural habitats, such as prairie and wetlands, also has benefited local wildlife populations.
Across from the site office, is a 3-acre tallgrass prairie with more than 50 species of native plants. Numerous species of wildflowers bloom in the summer, including compass plant, blazing star, purple coneflowers, rattlesnake master, American feverfew and stiff tickseed.
Deer, red foxes, raccoons, squirrels, woodchucks, quail, doves and songbirds, including bluebirds, are among the wildlife species to be seen. More than 200,000 waterfowl stop at the lake on their migratory travels north and south each year. Along with waterfowl, other types of birds commonly seen at the park include wading birds, such as herons and egrets, as well as shorebirds, songbirds and raptors.