Bombardier beetles are often unlucky snacks for frogs, but they have a tricky defense mechanism even after being eaten—make the frogs throw them back up.
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When threatened, the beetles shoot out a boiling mix of chemicals with incredible force. In one study, 43% of beetles survived being eaten and regurgitated by the frogs.
Read more in "See the Amazing Way a Beetle Survives Being Eaten"
Bombardier Beetles Squirt Boiling Anal Chemicals to Make Frogs Vomit | National Geographic