The larva of a the thistle tortoise beetle deposits poop on its back as a shield.
Judy Gallagher via Flickr (CC BY 2.0)
These uses of poop for protection are stranger than fiction
Defense by dung doesn't always elicit disgust in predators to repel them
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Ancient poop analysis reveals extinct species of bacteria
Scientists analyzed bacterial genomes from 1000-2000 year feces