How butterflies can eat cyanide

You’re a plant. How about deploying built-in cyanide bombs to defend against those that would eat you? It’s a nifty tactic that some plants actually use, but some caterpillars are so tough that they eat those cyanide bombs for breakfast.

For lunch and dinner, too. The caterpillars of the tropical butterfly Heliconius sara eat nothing but passion vines, which means they should be dead.