This family of wasp is mostly solitary instead of living in nests and in large numbers. Only males have wings and fly, the ground-laden females can deliver a painful sting and should not be trifled with.
Yellow Velvet Ant larvae are parasitic. Females lay their fertilized wasp eggs in the nest of other bees or wasps. The Yellow Velvet Ant larvae hatch first and then devour the other species' larvae.