 Only two species ("T. nakipa" and "T. boharti") have green unstriped morphs that feed on needle-like foliage; both are generalist feeders that also feed on broadleaf hosts.The species "Timema cristinae" exhibits both striped and unstriped populations depending on the host plant, a form of polymorphism that clearly illustrates the camouflage function of the stripe.The earliest ancestors of this species were generalists that fed on plants belonging to both the genera "Adenostoma" and "Ceanothus".