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I’ve mentioned this before but I worked at a zoo and we provided all kinds of plants to primates that were medicinal for just this reason, they’re very clever and often treat their illnesses before the keepers even know they’re sick. Not just great apes either, capuchins and lemurs that aren’t nearly as bright do it too.
I think that’s probably it. I know it’s always a game when you get the clothes out the dryer after a while to work out if it’s still damp or if it’s just cold.