Mary Poppins taught us that a spoonful of sugar makes the medicine go down. A bumblebee’s favorite sugary drink may already be laced with medicine. And bees seem to dose themselves with medicinal nectar when they’re suffering from a gut full of parasites.
Plants manufacture many chemical compounds to defend against attackers. Some of these are familiar to humans—like capsaicin, the potent weapon made by chili pepper plants. But not every animal enjoys painful food experiences like we do,