Diverse natural habitats, including forested stream corridors, unique Flatwoods, caves and open fields abound at Jefferson Proving Ground. A majority of acreage within JPG is comprised of natural vegetation communities.
A Great Blue Heron rookery with over 150 nests has been protected since its discovery, and seven species of bats have been identified at JPG. The Federally endangered Indiana Bat forages primarily along the wooded stream corridors. Bald eagle and osprey frequent the area of Old Timbers Lake, and migrating neo-tropical birds, including a large number of warblers, use JPG extensively.
JPG has one of the largest contiguous canopy forests east of the Mississippi.
Because of the diverse vegetation, from open meadow to mature hardwood forests, wildlife species such as reptiles, amphibians, and mammals are also abundant and varied at JPG.
The installation includes diverse grasslands to support the local fauna.