The bootlace worm found washed up on Scottish beaches can stretch to more than 55 metres when uncoiled, making it longer than a blue whale, and its mucus contains a peptide that paralysed crabs and killed or permanently paralysed juvenile cockroaches in laboratory tests
The bootlace worm Lineus longissimus, a strand of black tissue only millimetres wide, was measured at 55 metres on a Scottish beach in 1864 — longer than any blue whale. Its mucus can kill crabs and cockroaches.