The parasitic lifestyle has been lost several times, including among the ants, bees, and yellowjacket wasps. As a result, the order Hymenoptera has many families of parasitoids intermixed with non-parasitoid groups. The Hymenoptera, Apocrita, and Aculeata are all clades, and each has both parasitic and non-parasitic species. The parasitoid wasps do not form a clade on their own. 