The wasps that horrified Darwin reveal evolution's one-way streets

Summary
Few insects have a more gruesome lifestyle than Darwin wasps. Rather than simply hunting other animals, these parasitic wasps lay their eggs on or inside living hosts, including caterpillars, beetles and spiders. Their larvae then feed on their hosts, gradually consuming them and eventually killing them.
Description from Phys.
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The wasps that horrified Darwin reveal evolution's one-way streets
Few insects have a more gruesome lifestyle than Darwin wasps. Rather than simply hunting other animals, these parasitic wasps lay their eggs on or inside living hosts, including caterpillars, beetles and spiders. Their larvae then feed on their hosts, gradually consuming them...
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