They are able to switch hosts several times even as adults.

:Subclass Pentastomida (tongue worms): Vermiform endoparasites. The larvae develop in the tissues of mammals, reptiles, amphibians, fish, and a few species of coprophagous insects, which all are intermediate hosts. When eaten by other mammals, reptiles, amphibians and birds, which are the definitive hosts, the parasite develops to an adult (length 1-16 cm) found in the host's respiratory tracts. The genus