It's not weird for some species to incorporate toxins from their diet as defenses: poison dart frogs, monarch butterflies, sea slugs, etc

But let's get weird and circuitous with it

#Nicotine was developed by plants to kill insects. As a quirk of #neurochemistry, humans use it addictively, so cigarette butts are everywhere

Birds have figured out they can use them in their nests to repel insect parasites

The original intention of nicotine

Weird!

https://www.sciencedirect.com/science/article/pii/S0003347226000011

#Science #Ecology