It seems quite toxic in fruit flies if the hydrogenase has been disabled: https://www.sciencedirect.com/science/article/abs/pii/096517489290115U https://www.sci

It seems quite toxic in fruit flies if the hydrogenase has been disabled: https://www.sciencedirect.com/science/article/abs/pii/096517489290115U https://www.sciencedirect.com/science/article/abs/pii/096517... So to get to OP's point, I am assuming that if the hornets couldn't detoxify acetaldehyde, then they would exhibit some sort of "hangover" even if it didn't kill them. But even the 80% ABV hornets seemed totally unaffected.