The forest is home to a sizeable population of amphibians and reptiles, as well as a host of beetles, butterflies and other insects. A common sight are great anthills, the nests of wood ants, of which there are several species in the region. The Wasgau and the area of the Hermersberger Hof are two of the few places in Germany where colonies of narrow-headed ant have survived. And the highly endangered great and spotted antlions may often be seen in the sands of the bunter sandstone (Rehberg beds). Their larvae build funnel traps in the sand and feed on ants and other animals that fall into it using their pincer-like mandibles.