Blackworms are ultra-fast swimmers, and they tangle up into worm balls to protect themselves from predators – but leeches have an ingenious method of catching them called “spiral entombment”
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/d1/82/d18228f6-d319-4525-bb18-78b829f0791f/mammalevolution_web.jpg "How to Make a Mammal in Nine Evolutionary Steps")
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