Beetle larvae protect themselves from predators by producing a deadly toxin after feeding on Commiphora tree.

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"In Namibia the Commiphora tree is the host plant of the leaf beetle. When its larvae feed on the leaves, they produce a toxin not found in adults, which a Kalahari Desert bushman squeezes onto an arrow tip. The poison on a single arrow can fell an adult antelope." (Chadwick 1998:114)

Journal article
Planet of the Beetles: From humble ladybugs to brilliant scarabs, beetles both help and bedevil us. A third of the world's identified insects are beetles, and they are everywhere

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