The pollen wasps are behaviourally distinct from all other aculeate (stinging) wasps. Indeed in behaviour they are bee-like. Like bees, they evolved from predatory wasps that, like most modern aculeate wasps, hunted insects or spiders for feeding their larvae. The pollen wasps, like the bees, are not hunters. They collect pollen and nectar from flowers for provisioning their nest cells. The change from hunting invertebrates to collecting pollen and nectar, evolved in parallel - the bees and the spheciform wasps being grouped as Apoidea and the pollen wasps and the co-evolved wasp families, including the ants, as Vespoidea.