The world record for longest animal is held by the bootlace worm (Lineus longissimus), a Nemertean or ribbon worm from the North Sea. In fact, it's held by a Scottish bootlace worm that was washed ashore in 1864. But is that record reliable? How long do bootlace worms actually get? And what is a ribbon worm anyway?

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Intro and outro music by Audionautix. Other music in this episode by Kevin MacLeod. All licensed under Creative Commons Attribution.

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