Taking its name from the Appalachian Trail that runs through this 25-acre area within Bear Mountain State Park, Trailside is home to four natural history museums and outdoor habitats for indigenous animals that are unable to survive in the wild.

The Palisades Park Commission teamed with Coyle & Caron to re-envision a section of the zoo adjacent to the Trail. Menagerie-style cages were removed opening up long views into a valley and seasonal wetland. A new loop trail diverts visitors from the Trail into an oak forest to observe wildlife in large, transparent mesh enclosures. Habitats for red fox, bobcat and porcupine are designed to incorporate natural features such as large trees and rock outcrops for visual interest and animal enrichment. Each habitat includes a small night house designed in the style of the nearby WPA park buildings and museums.