Sugar gliders are generally 5 to 12 inches (120 to 320 millimeters) long with a tail that is 6 to 9 inches (150 to 230 millimeters) long. Their fur is bluish-gray with a pale belly and a dark stripe that runs down the back. Sugar gliders have gliding membranes that allow efficient movement. Sugar gliders are nocturnal and are energetic at night. They make noises such as chirping, barking, and chattering. They feed on insects and on the sap, gum, and nectar from various trees and plants. In the wild, they live in colonies that nest in tree hollows.