Primarily dominating the skies of Skull Island are not birds, but flying rodents. While the most impressive of these live in the uplands, the lowland jungle is haunted by the eerie shrieks of the smaller howlers, shaggy aerial predators with leathery wings are sharpened teeth. Their bulbous eyes are keen, able to pierce the obscuring dark beneath the canopy where they hunt birds, smaller mammals (like Skull Island rats), large insects and lizards. A particular favorite is the Skull Island white bat, which the howlers tear from their roosts during the day or catch on the wing at dusk.
- The howler is very similar to the cryptic Ahool.