Beewolf symbiosis: Protective shield for allies

Researchers at the Max Planck Institute for Chemical Ecology in Jena and Johannes Gutenberg University in Mainz, Germany, report in a new study in the journal PNAS that the symbiosis of beewolves with their bacterial helpers includes protection of the symbionts from toxic nitric oxide, which beewolf eggs release to disinfect the brood cavity. The white secretion from the antennae of female beewolves, which also contains the symbionts, provides an effective diffusion barrier.