Manipulative parasites hijack hornets

Hornets put fear into the minds of most, but there is a parasite that the hornets fear (if indeed they are capable of fear). Sphaerularia vespae is a parasitic nematode that infects the Japanese yellow hornet (Vespa simillima). The infection invades and resides in the abdomen of female hornets. The nematode sterilises the host (much like other parasitic castrators), turning her into a cozy nursery for baby worms. But a new study has shown that they are capable of doing more than just making the hornet barren.

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