What if you could vaccinate a loved one by kissing them? Well, then you might be an insect.
Ants swap spit that contains disease-fighting compounds, so a few members of a colony can essentially immunize the rest mouth-to-mouth, says Rebeca Rosengaus, an associate professor and behavioral ecologist at Northeastern.
Termites sometimes do something similar, but their pathogen-battling material comes out the other end. Other times, they do a little dance.
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